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: 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
Option A

Question: One water pump can fill half of a certain empty tank in 7 hours. Another pump can fill half of the same tank in 7.5 hours. Working together, how long will it take these two pumps to fill the entire tank?

Option A: 7 7/13

Option B: 1 5/8

Option C: 3 1/4

Option D: 7 7/29

Option E: 3 1/2
Option D

Question: There is a rectangular prism made of 1 in cubes that has been covered in tin foil. There are exactly 128 cubes that are not touching any tin foil on any of their sides. If the width of the figure created by these 128 cubes is twice the length and twice the height, what is the measure y in inches of the width of the foil covered prism?

Option A: 4

Option B: 6

Option C: 8

Option D: 9

Option E: 10
Option E