Assertion(A)  : Graphite is slippery and used as a lubricant.&

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Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative.

Assertion(A)  : Graphite is slippery and used as a lubricant. 

Reason (R)    : Graphite has free electrons. 

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.