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: There are n arithmetic means between 3 and 45 such that the sum of these arithmetic means is 552. find the value of n.

 Option A: 11

 Option B: 15

 Option C: 17

 Option D: 21

 Option E: 23
Option E

Question: A train 175 m long pass a telegraph pole in 5 seconds. Find the speed of the train

 Option A: 66 km/hr

 Option B: 68.4 km/hr

 Option C: 72 km/hr

 Option D: 126 km/hr

 Option E: None
Option D

Question: A family has two children. find the probability that both the children are girls given that at least
one of them is a girl?

 Option A: 1/3

 Option B: 2/3

 Option C: 2/5

 Option D: 3/7

 Option E: 3/11

Option A