Definition: 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.
Input: Question: If the cost price of 26 apples is equal to the selling price of 20 apples, the gain percent is

 Option A: 25

 Option B: 30

 Option C: 35

 Option D: 40

 Option E: 45

Option B