Assertion (A) : The dehydration of alcohols by conc. `H_(2)SO_(4)` involves the formation of carbocation.
Reason (R) : The protonated alcohol molecule loses water molecule in the second step.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true and R is not a correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.