Assertion: The molality and molarity of very dilute aqueous solutions differ very little.
Reason: The density of water is about `1.0 g cm^(-3)` at room temperature.
A. (a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. (b)If both assertion and reason are true and the reason is not the correct explanation of the assertion.
C. (c )If assertion is true but reason is false.
D. (d)If assertion is false but reason is true.