Q: 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.
Problem: a hall 36 m long and 15 m broad is to be paved with stones, each measuring 2 dm by 5 dm. the number of stones required is :
Options: ['a. 180', 'b. 1800', 'c. 5400', 'd. 18000', 'e. 1.8']
A:
c