Task: Question Answering
Input (English): 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
Output (English): a