We start with 2-cyclohexenone and subject it to (separate) reagents/reaction sequences A, B, C and D.
Each of these correspondingly yields the products.
From the options given, choose the correct ones that could be the reaction sequences
Wolff-Kishner reduction of the given compound gives:
Sequences 2 and 3 are based on conjugate addition using Gilman reagents:
This one is easier:
The last one could be done in several ways (watch video):