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: If a committee of 2 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?

Option A: 20

Option B: 40

Option C: 50

Option D: 80

Option E: 120
[A]: Option B

[Q]: Question: In what time will a train 200 m long cross an electric pole, it its speed be 144 km/hr?

Option A: 2.5 sec

Option B: 2.9 sec

Option C: 3.5 sec

Option D: 7.5 sec

Option E: 5 sec
[A]: Option E

[Q]: Question: Two pipes A and B can separately fill a tank in 20 and 15 minutes respectively. A third pipe C can drain off 45 liters of water per minute. If all the pipes are opened, the tank can be filled in 15 minutes. What is the capacity of the tank?

Option A: 590 liters

Option B: 540 liters

Option C: 820 liters

Option D: 900 liters

Option E: 580 liters
[A]:
Option D