You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[Q]: Question: For positive integers x and z, which of the following can be written as z^2?

 Option A: x^2+1

 Option B: x^2-1

 Option C: x^2-24

 Option D: x^2+11

 Option E: x^2-11
[A]: Option D


[Q]: Question: Evaluate combination
100C98=100!/(98)!(2)!

 Option A: 4950

 Option B: 1510

 Option C: 4170

 Option D: 3170

 Option E: None of these
[A]: Option A


[Q]: Question: The probability that a card drawn from a pack of 52 cards will be a diamond or a king is

 Option A: 2/13

 Option B: 4/13

 Option C: 1/13

 Option D: 1/52

 Option E: None
[A]:
Option B