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: For an employee to qualify for early retirement at a certain company, the sum of the employee's age and years of service must be at least 72, If Sue was K years old when she was hired by the company, what is the minimum age at which she could possibly qualify for early retirement.

Option A: K+36

Option B: 2K+36

Option C: (72+K

Option D: (72-K

Option E: 2(72-K
[A]: Option C

[Q]: Question: Two pipes A&B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min.

Option A: 8 min

Option B: 3 min

Option C: 21 min

Option D: 23 min

Option E: 24 min
[A]: Option A

[Q]: Question: A and B can do a piece of work in 45 days and 40 days respectively. They began to do the work together but A leaves after some days and then B completed the remaining work in 23 days. The number of days after which A left the work was

Option A: 5 days

Option B: 6 days

Option C: 7 days

Option D: 9 days

Option E: 8 days
[A]:
Option D