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Assertion: One mole of a substance alway...

Assertion: One mole of a substance always contain the same number of entities, no metter what the substance may be.
Reason : One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of the `""^12C` isotope.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

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