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 cricket player whose bowling average was 23.50 runs per wicket, takes 5 wicket for 52 runs in a match. due to this his average decreases by 0.50. what will be the number of wickets taken by him till the last match ?
Options: a. 64, b. 72, c. 131, d. 456, e. 108
c

Problem: it is only in the second option we find the sentence a in continuation with the opening sentence d. sentence a alone explains, why the fear has such enormous effect on the human beings.
Options: a. 28, b. 99, c. 728, d. 27, e. 271
b

Problem: two spherical balls lie on the ground touching. if one of the balls has a radius of 9 cm, and the point of contact is 10 cm above the ground, what is the radius of the other ball ( in centimeters ) ?
Options: a. 50 / 4, b. 70 / 6, c. 80 / 7, d. 90 / 8, e. 100 / 9
d