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.

[EX Q]: Question: On dividing 21 by a number, the quotient is 10 and the remainder is 1. Find the divisor.

Option A: 1

Option B: 2

Option C: 4

Option D: 6

Option E: 7
[EX A]: Option B

[EX Q]: Question: Rs.8000 become Rs.11256 in a certain interval of time at the rate of 5% per annum of C.I. Find the time?

Option A: 6 YEARS

Option B: 7

Option C: 5

Option D: 3

Option E: 4
[EX A]: Option B

[EX Q]: Question: In the coordinate plane, rectangular region R has vertices at (0,0), (0,3), (4,3), and (4,0). If a point in region R is randomly selected, what is the probability that the point's y-coordinate will be greater than its x-coordinate?

Option A: 7/12

Option B: 5/12

Option C: 3/8

Option D: 1/3

Option E: 1/4
[EX A]:
Option C