Directions.In the following question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices:
Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Assertion is correct statement but reason is wrong statement.
Assertion is wrong statement but reason is correct statement.
Assertion:higher the work function of a metal greater is the threshold freqeuncy.
Reason:The work function of alkali metals is usually lower than for other metals.

Options

A. A
B. B
C. C
D. D