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 x 2 + kx - 3, is divisible by ( x - 1 ), what is the value of k
Options: a. - 1, b. 1, c. 2, d. - 1, e. 0
[EX A]: c

[EX Q]: Problem: if a man lost 10 % by selling oranges at the rate of 12 a rupee at how many a rupee must he sell them to gain 44 % ?
Options: a. 6.5, b. 7.5, c. 7, d. 8, e. 2
[EX A]: b

[EX Q]: Problem: 30 is to be divided into two parts such that the sum of 10 times the first and 22 times the second is 780. the bigger part is :
Options: a. 33, b. 34, c. 26, d. 10, e. 19
[EX A]:
d