E is correct. others are with errors.

limestone wrote:Since 1965 there are four times as many Black college students enrolled, and the one million Black people in college today represent 11 percent of all college students.

A.
B. The enrollment of Black college students was only one-fourth in 1965
C. The enrollment of Black college students has increased four times from 1965 on
D. Quadrupling since 1965, there are now four times as many Black college students enrolled
E. The enrollment of Black college students has quadrupled since 1965

[spoiler]OA : E[/spoiler]

limestone wrote:Since 1965 there are four times as many Black college students enrolled, and the one million Black people in college today represent 11 percent of all college students.

A.
B. The enrollment of Black college students was only one-fourth in 1965
C. The enrollment of Black college students has increased four times from 1965 on
D. Quadrupling since 1965, there are now four times as many Black college students enrolled
E. The enrollment of Black college students has quadrupled since 1965

[spoiler]OA : E[/spoiler]

Yup, E is the correct answer.

limestone wrote:Since 1965 there are four times as many Black college students enrolled, and the one million Black people in college today represent 11 percent of all college students.

A.
B. The enrollment of Black college students was only one-fourth in 1965
C. The enrollment of Black college students has increased four times from 1965 on
D. Quadrupling since 1965, there are now four times as many Black college students enrolled
E. The enrollment of Black college students has quadrupled since 1965

[spoiler]OA : E[/spoiler]

Choice A features a present-tense verb with "since 1965" where we would expect "There are four times as many as there were in 1965"
Choice B does not tell us what the enrollment was one-fourth of.
Choice C has "from 1965 on", which is wordier than "since 1965". Also "has increased four times" does not necessarily mean the same thing as "has increased fourfold"; as written, it just means the number has gone up on four occasions.
Choice D has a dangling modifier; it's not grammatically clear what has quadrupled.

Jim@Grockit wrote: Choice C has "from 1965 on", which is wordier than "since 1965". Also "has increased four times" does not necessarily mean the same thing as "has increased fourfold"; as written, it just means the number has gone up on four occasions.

Jim,That was an excellent explanation to rule out choice 'C'.

Jim@Grockit wrote:

limestone wrote:Since 1965 there are four times as many Black college students enrolled, and the one million Black people in college today represent 11 percent of all college students.

A.
B. The enrollment of Black college students was only one-fourth in 1965
C. The enrollment of Black college students has increased four times from 1965 on
D. Quadrupling since 1965, there are now four times as many Black college students enrolled
E. The enrollment of Black college students has quadrupled since 1965

[spoiler]OA : E[/spoiler]

Choice A features a present-tense verb with "since 1965" where we would expect "There are four times as many as there were in 1965"
Choice B does not tell us what the enrollment was one-fourth of.
Choice C has "from 1965 on", which is wordier than "since 1965". Also "has increased four times" does not necessarily mean the same thing as "has increased fourfold"; as written, it just means the number has gone up on four occasions.
Choice D has a dangling modifier; it's not grammatically clear what has quadrupled.

In B
The enrollment of Black college students was only one-fourth in 1965
Isnt One-fourth (of the enrollment) implicit