Assertion : Molality is perferred to molarity for expression the concentration of the solution.
Reason : Molality can be determined more easily than molarity.
A. If both assertion are reason are correct and reason is correct explanation for assertion.
B. If both assertion and reason are corrct but reason is not correct explanation for assertion.
C. If assertion is corrct but reason is incorrect.
D. If assertion and reason both are incrrect.