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.

[EX Q]: Problem: if a no. when divided by 44, gives 432 as quotient and 0 as remainder. what will be the remainder when dividing thesame no. by 31
Options: a. 2, b. 4, c. 5, d. 7, e. 8
[EX A]: c

[EX Q]: Problem: find the curved surface area, if the radius of a cone is 35 m and slant height is 30 m ?
Options: a. 1100, b. 2200, c. 3300, d. 4400, e. 5500
[EX A]: c

[EX Q]: 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
[EX A]:
b