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: What is the rate percent when the simple interest on Rs.800 amount to Rs.160 in 4 Years?

Option A: 5%

Option B: 6%

Option C: 2%

Option D: 95%

Option E: 1%
[A]: Option A

[Q]: Question: A coin is tossed two times. What is the probability that there is at the least one tail?

Option A: 3/4

Option B: 31/37

Option C: 31/18

Option D: 31/10

Option E: 31/19
[A]: Option A

[Q]: Question: If the area of circle O is 16, what is the length of an arc on the circle formed by a central angle measuring 35 degrees?

Option A:

Option B: 3/2

Option C: 2

Option D: 5/2

Option E: 7/9
[A]:
Option E