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: the diagonal of a rectangle is 41 cm and its area is 20 sq. cm. the perimeter of the rectangle must be :
Options: ['a. 18', 'b. 28', 'c. 38', 'd. 48', 'e. 58']

Answer: a

Question: Problem: on the number line, the number p is twice as many units from - 2 as - 2 is from 5. if p is less than 2, what is the value of p ?
Options: a. 16, b. 10, c. 6, d. 10, e. 14

Answer: a

Question: Problem: a train is 485 meter long is running at a speed of 45 km / hour. in what time will it pass a bridge of 140 meter length
Options: a. 20 seconds, b. 30 seconds, c. 40 seconds, d. 50 seconds, e. none of these

Answer:
d