Detailed Instructions: 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.
Q: Problem: 29 persons can repair a road in 16 days, working 5 hours a day. in how many days will 30 persons, working 6 hours a day, complete the work ?
Options: a. 12.88, b. 3.88, c. 13.88, d. 15, e. 18.8
A:
a