rate of increase

[asp_2010]

1． In the 1980's the rate of increase of the minority population of the United States was nearly twice as fast as the 1970's.
(A) twice as fast as
(B) twice as fast as it was in
(C) twice what it was in
(D) two times faster than that of
(E) two times greater than


I am confused between B and C. Can anyone help me by telling how we can eliminate one of the options and why?

2. A discussion of our nations foreign policy must begin with the fact of there being an independent Western Europe which now thinks of itself in trans-nationalist terms.

A. A discussion of our nations foreign policy must begin with the fact of there being
B. Beginning any discussion of our nations foreign policy must be the fact of there being
C. Any discussion of our nations foreign policy must begin with the fact that there is
D. Any discussion of our nations foreign policy must begin by acknowledging the existence of
E. To begin discussing our nations foreign policy thee must be an acknowledgment of the fact that

Pls explain this one as well with explanation

[gmatv09]

1. C

2. D

[mmslf75]

1. C

2. D

PLS MENTION THE SOURCE OF THE PROBLEM !

@gmatv09
1st

Is C proper here ??

WHAT was IN !!


2nd
IMO C

[papgust]

Very recently, i read it from OG-11 that "double what it was in.." construction is awkward and wordy. I'm not sure how different it is from "twice what it was in..", but i guess this would also be awkward w.r.t GMAT standards if "double what it was in.." is awkward.

[asp_2010]

hey the option of 1 st is C and second one is A.

The source is brutal SC test from GMAT club.

Regarding first SC, in MGMAT SC Guide i read the following...hope it will help:

1) If you want to relate quantities by multiplication, use "times and as...as..." together.
Example: The man is FIVE TIMES AS OLD AS his grandson  Right
The man is FIVE TIMES OLDER THAN his grandson  Wrong
The first sentence means that man's age= 5*his grandson's age.
In the second example, the author is technically saying that the man is 6 times as old as his grandson.
2) Use "times without as or than" to indicate direct multiplication. (Twice means two times)
Examples: 1) The cost of the ticket is 12$, SIX TIMES the cost ten years ago.
2) The concert was attended by 300 people, TWICE the previous attendance.

The logic behind second one is not known....any help will be greatly appreciated.