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: mary, peter, and lucy were picking chestnuts. mary picked twice as much chestnuts than peter. lucy picked 2 kg more than peter. together the 3 of them picked 26 kg of chestnuts. how many kilograms did mary pick ?
Options: a. 12, b. 24, c. 48, d. 52, e. 37
A:
a