instruction:
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.
question:
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
answer:
Option D


question:
Question: Find the equation of a line which passes through A(4, -1) and is parallel to x axis.

 Option A: y=-2

 Option B: y=3

 Option C: y=2

 Option D: y=-1

 Option E: y=0
answer:
Option D


question:
Question: A corporation triples its annual bonus to 50 of its employees. What percent W of the employees’ new bonus is the increase?

 Option A: 50%

 Option B: 662⁄3%

 Option C: 100%

 Option D: 200%

 Option E: 300%
answer:

Option B