Sentence Correction

hi guys
isnt 'nearly' an adverb and 'fiftyperccent a noun' ?if yes they r then is nearly fifty percent correct gram,matically?adverb +noun?the oa is b but i m a bit confused;someone plz clarify;i wld appreciate that!!!!

266. During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.
(A) During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.
(B) During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 to its nadir in 1933.
(C) At the time of the Great Depression, industrial output fell by almost fifty percent from its 1929 peak down to its 1933 nadir.
(D) At the time of the Great Depression, industrial output fell from its peak in 1929, by nearly fifty percent, to it nadir in 1933.
(E) During the Great Depression, industrial output fell from its peak in 1929 to its nadir in 1933 by nearly fifty percent.

by nearly fifty percent is suppose to modify fell thus it should be placed close to fell. Hence Ans B

Hope you get it now.

can i have a detailed explanation please

dude,If you see the option A, there is a redundancy in that.It says Fell to its nadir and then uses DOWN.
So A is already eliminated.

"fell" and "down" are redundant. So, A and C are out.
In D and E, "by nearly fifty percent" doesn't modify "fell".

So, B is the right answer.

B is the correct answer.