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.

[EX Q]: Question: Mr. Thomas invested an amount of 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in 2 years be 3508, what was the amount invested in Scheme B?

 Option A: 6400

 Option B: 6500

 Option C: 7200

 Option D: 7500

 Option E: None of these
[EX A]: Option A

[EX Q]: Question: The average of first seven prime numbers which are between 30 and 70 is

 Option A: 35.4

 Option B: 42

 Option C: 44.4

 Option D: 57

 Option E: 67
[EX A]: Option C

[EX Q]: Question: A basket has 4 apples and 3 oranges. Two fruits are picked at random. The probability that at least 2 apples are picked is

 Option A: 2/7

 Option B: 2/9

 Option C: 3/7

 Option D: 3/10

 Option E: 4/7
[EX A]:
Option A