The teacher asked the students to record the boiling point of the acidic solution.

Which sentence uses the word solution as it is used in the box above?

A.
Ron came up with a brilliant solution at the last minute to clear the misunderstanding.
B.
As a solution to heavy and constant rains, people in these regions build strong houses with sloping roofs.
C.
Jess added more sugar to the water and then poured this solution in the bowl containing lemon juice.
D.
Nathan spent an hour finding the solution to the complex math problem.