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: 23, 18, 16, 11, 9, 4 ?

 Option A: 3

 Option B: 2

 Option C: 7

 Option D: 5

 Option E: 1
[A]: Option B


[Q]: Question: 5, 9, 17, 29, 45, ?

 Option A: 65

 Option B: 56

 Option C: 74

 Option D: 57

 Option E: 32
[A]: Option A


[Q]: Question: What is the cost price of an article sold by a trader at 10% loss, given that the trader would have made a profit of 9% if he had sold it for $60 more?

 Option A: $526.31

 Option B: 527.31

 Option C: 516.31

 Option D: 528.31

 Option E: 524.31
[A]:
Option A