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 bag is filled with pennies and nickels in the ratio of 5 to 3. There are 30 nickles in the bag, how many coins are there in that bag?

Option A: 70

Option B: 65

Option C: 75

Option D: 85

Option E: 80
[A]: Option E

[Q]: Question: How many inches are in 2000 millimeters? (round your answer to the nearest hundredth of of an inch).

Option A: 51.45 inches

Option B: 86.09 inches

Option C: 67.34 inches

Option D: 34.98 inches

Option E: 78.74 inches
[A]: Option E

[Q]: Question: The number of positive integer solutions for the equation x +y +z + t = 15 is

Option A: 654

Option B: 584

Option C: 384

Option D: 364

Option E: 394
[A]:
Option D