Assertion :In Young's double slit experiment interference pattern disappear when one of the slits is closed.

Reason: Interference occurs due to superimposition of light waves from two coherent sources.

A. both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. Assertion is True but the Reason is False.
D. both Assertion & Reason are false.