Assertion : `sp^(2) - sp^(2)` overlapping in more efficient than `sp^(3)-sp`.
Reason : `sp^(3)` orbital has higher electrons density than `sp^(2)` orbital.
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 a correct explanation of A
C. A ts true but R is false
D. A is false but R is true