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.

[EX Q]: Question: A patient was given five pills which he is required to take one after every twenty minutes.
How long can the pills run for him?

 Option A: 1 hour

 Option B: 1 hour 20 minutes

 Option C: 1 hour 30 minutes

 Option D: 1 hour 35 minutes

 Option E: 1 hour 40 minutes
[EX A]: Option B

[EX Q]: Question: Simplify: 250 x 250 - 100 x 100

 Option A: 761200

 Option B: 761400

 Option C: 52500

 Option D: 761500

 Option E: None of them
[EX A]: Option C

[EX Q]: Question: A party supply store sells noisemakers arranged on display such that each of the three different colors of noisemakers, red, blue, and purple are consecutive in a repeating pattern. If four consecutively displayed noisemakers are purchased, what is the probability that two of the noisemakers are purple?

 Option A: 2/3

 Option B: 1/9

 Option C: 2/9

 Option D: 1/3

 Option E: 2/7
[EX A]:
Option D