You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[Q]: Question: The 120 students in a group are to be seated in rows so that there is an equal number of students in each row. Each of the following could be the number of rows EXCEPT

 Option A:  4

 Option B:  20

 Option C:  30

 Option D:  40

 Option E:  90
[A]: Option E


[Q]: Question: Choose the missing terms out of the given alternatives.
QPO, SRQ, UTS, WVU, ?

 Option A: XVZ

 Option B: ESD

 Option C: ZYA

 Option D: VWX

 Option E: YXW
[A]: Option E


[Q]: Question: Keats Library purchases a number of new books, all in the category of biography, and the library does not acquire any other books. With the addition of the new biographies, the biography collection of the library amounts to 25% of the total number of books in the library. If prior to the purchase, only 20% of the books in Keats Library were biographies, by what percent has the number of biographies in the library increased?

 Option A: 23%

 Option B: 28%

 Option C: 33%

 Option D: 38%

 Option E: 43%
[A]:
Option C