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: A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:

Option A: 2 km/hr

Option B: 1 km/hr

Option C: 4 km/hr

Option D: 6 km/hr

Option E: 5 km/hr
[EX A]: Option B

[EX Q]: Question: At a local supermarket, a box of cereal usually costs 22 dollars. This week, the supermarket sells the box of cereal for 11 dollars. How much money will you save if you buy this cereal at this supermarket?

Option A: 11 dollars

Option B: 13 dollars

Option C: 14 dollars

Option D: 12 dollars

Option E: 10 dollar
[EX A]: Option A

[EX Q]: Question: M = {-6, -5, -4, -3, -2}
T = {-3, -2, -1, 0, 1, 2, 3, 4, 5}
If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?

Option A: 0

Option B: 3/7

Option C: 2/5

Option D: 1/2

Option E: 5/9
[EX A]:
Option E