Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: \( pK_a \) value of phenol is \( 10.0 \) while that of ethanol is \( 15.9 \).
Reason R: Ethanol is stronger acid than phenol.
In the light of the above statements, choose the correct answer from the options given below: