Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[EX Q]: Problem: the price of a certain painting increased by 30 % during the first year and decreased by 15 % during the second year. the price of the painting at the end of the 2 - year period was what percent of the original price ?
Options: a. 102 %, b. 105 %, c. 110.5 %, d. 112.5 %, e. 100 %
[EX A]: c

[EX Q]: Problem: there are 7 pairs of socks and 2 socks are worn from that such that the pair of socks worn are not of the same pair. what is the number of pair that can be formed.
Options: a. 40, b. 49, c. 41, d. 56, e. 42
[EX A]: e

[EX Q]: Problem: in the first m games of a team ' s season, the ratio of the team ' s wins to its losses was 1: 2. in the subsequent n games, the ratio of the team ´ s wins to losses was 2: 3. if m: n = 4: 5, what was the ratio of the team ' s wins to its losses for all m + n games ?
Options: a. 7: 18, b. 9: 23, c. 10: 17, d. 23: 54, e. 31: 77
[EX A]:
c