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: if the radius of a cylinder is made 3 times and so is the height, what is the new volume of the cylinder divided by the old one ?
Options: a. 27., b. 2., c. 6., d. 4., e. 10.
a

Problem: if the range q of the 6 numbers 4, 314, 710 and x is 12, what is the difference between the greatest possible value of x and least possible value of x ?
Options: a. 0, b. 2, c. 12, d. 13, e. 15
d

Problem: an amount of money is to be distributed among faruk, vasim and ranjith in the ratio 3: 5: 7. if vasims share is rs. 1500, what is the difference between faruk ' s and ranjith ' s shares ?
Options: a. rs 1200, b. rs 1500, c. rs 1600, d. rs 1900, e. rs 1700

a