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: a can give b 100 meters start and c 200 meters start in a kilometer race. how much start can b give c in a kilometer race ?
Options: a. 111.12 m, b. 221.12 m, c. 271.12 m, d. 611.12 m, e. 191.12 m
[EX A]: a

[EX Q]: Problem: of all the homes on gotham street, 1 / 3 are termite - ridden, and 4 / 7 of these are collapsing. what fraction of the homes are termite - ridden, but not collapsing ?
Options: a. 1 / 3, b. 1 / 4, c. 1 / 5, d. 1 / 6, e. 1 / 7
[EX A]: e

[EX Q]: Problem: a certain number of horses and an equal number of men are going somewhere. half of the owners are on their horses ' back while the remaining ones are walking along leading their horses. if the number of legs walking on the ground is 40, how many horses are there ?
Options: a. 8, b. 12, c. 14, d. 16, e. 18
[EX A]:
a