The question given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.

(a) Both Assertion and reason are correct statements, and Reason is the correct explanation of assertion.

(b) Both Assertion and reason are correct statements, and Reason is not the correct explanation of assertion.

(c) Assertion is correct, Reason is the wrong statement.

(d) Assertion is wrong, but Reason is the correct statement.

Assertion: Elevation in boiling point is a colligative property.

Reason: Elevation in boiling point is directly proportional to molarity. 

(c)

Experiments have shown that for dilute solutions the elevation of boiling point (∆Tb ) is directly proportional to the molal concentration of the solute (molality) in a solution.