i. (A), a compound with lowest number of C atoms, is unsaturated hydrocarbon and is optically active.
ii. (B), a compound with lowest number of C atoms, is unsaturated hydrocarbon and shows diastereomerism.
iii. (C), a compound with lowest number of C atoms and unsaturated hydrocarbon, shows both optical and geometrical isomerism.
Following is the reaction sequence of A, B, and C.

The structure of compound (A) is:

Options

A.
B.
C.
D.

Answer

B

Explanation

To show both geometrical and optical isomerisms in compound C, the alkene should be of the type , to have lowest molecular mass or lowest number of C atoms, R should be `Me` group.
So the answer is (b).