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: 8 persons can build a wall 140m long in 42 days. In how many days can 30 persons complete a similar wall 100 m long?

 Option A: 12

 Option B: 10

 Option C: 8

 Option D: 6

 Option E: 5
[A]: Option C


[Q]: Question: Two dice are tossed. The probability that the total score is a prime number is:

 Option A: 5/5

 Option B: 5/9

 Option C: 5/1

 Option D: 5/7

 Option E: 5/12
[A]: Option E


[Q]: Question: A manufacturing plant produces 2 products (bolts and screws). 3% of all products are defective. If the ratio of products made is 3:2, respectively, and the percentage of bolts defective 5%, what percentage of screws are defective?

 Option A: 1/3%

 Option B: 3%

 Option C: 5%

 Option D: 5/2%

 Option E: 5/3%
[A]:
Option E