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Consider the following compounds 
Hyperconjugation occurs in:
Hyperconjugation occurs in:
A
I only
B
II only
C
III only
D
I and III
Detailed Solution
Hyperconjugation needs $\alpha$-H atoms on a carbon attached to the radical carbon.
In I the radical carbon is attached to a quaternary carbon and a phenyl group (no $\alpha$-H); in II it carries three phenyl groups (no $\alpha$-H).
Only III has $\alpha$-H, so hyperconjugation occurs in III only.
In I the radical carbon is attached to a quaternary carbon and a phenyl group (no $\alpha$-H); in II it carries three phenyl groups (no $\alpha$-H).
Only III has $\alpha$-H, so hyperconjugation occurs in III only.