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: How many pieces of 0.85 metres can be cut from a rod 42.5 metres long?

 Option A: 30

 Option B: 40

 Option C: 50

 Option D: 60

 Option E: 70
[EX A]: Option C

[EX Q]: Question: A number when divided by 5 gives a number which is 8 more than the remainder obtained on dividing the same number by 34. Such a least possible number N is

 Option A: 74

 Option B: N=75

 Option C: N=175

 Option D: N=680

 Option E: 690
[EX A]: Option B

[EX Q]: Question: Which is a better investment 9% stock at 580 or 6 2/5 stock at 312?

 Option A: 9% stock at 580

 Option B: Both are equally good

 Option C: 6 2/5 stock at 312

 Option D: None

 Option E: Cannot be compared, as the total amount of investment is not given
[EX A]:
Option C