Assertion: `NaCI` when exposed in air it becomes wet.
Reason: `NaCI` contains hygroscopic impurities like `CaCI_(2), MgCI_(2)` etc.
A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are False