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: A cycle is bought for Rs.900 and sold for Rs.1150, find the gain percent?

 Option A: 15

 Option B: 20

 Option C: 27.77

 Option D: 40

 Option E: 12

A: Option C
****
Q: Question: If 3^x*4^y = 1,594,323 and x – y = 13, then x = ?

 Option A: 10

 Option B: 11

 Option C: 12

 Option D: 13

 Option E: 14

A: Option D
****
Q: Question: 99,998^2 - 2^2 =

 Option A: 10^10 - 2

 Option B: (10^5 – 2

 Option C: 10^4(10^5 – 2

 Option D: 10^5(10^4 – 2

 Option E: 10^5(10^5 – 4

A:
Option E
****