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: A coin is tossed two times. What is the probability that there is at the least one tail?

 Option A: 3/4

 Option B: 31/37

 Option C: 31/18

 Option D: 31/10

 Option E: 31/19
[A]: Option A


[Q]: Question: A certain number of workers can do a work in 85 days. If there were 10 workers more it could be finished in 10 days less. How many workers are there?

 Option A: 75

 Option B: 30

 Option C: 28

 Option D: 24

 Option E: 32
[A]: Option A


[Q]: Question: How many positive integers less than 100 are neither multiples of 5 or 6.

 Option A: a

 Option B: b

 Option C: c

 Option D: d

 Option E: e
[A]:
Option E