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.
--------
Question: Problem: lucy bought a 1 - year, 10000 certificate of deposit that paid interest at an annual rate of 8 percent compunded semiannually. what was the total amount of interest paid on this certificate at maturity ?
Options: a. 10464, b. 864, c. 816, d. 800, e. 480

Answer: d


Question: Problem: the average of 11 10 prime numbers which are odd is ?
Options: a. 17.72, b. 18.52, c. 19.63, d. 16.53, e. 15.63

Answer: a


Question: Problem: a and b can do a work in 5 days and 10 days respectively. a starts the work and b joins him after 4 days. in how many days can they complete the remaining work ?
Options: a. 6 days, b. 2 / 3 days, c. 8 days, d. 3 days, e. 9 days

Answer:
b