1. Interpret the parent name

   The compound is cyclohexane carbaldehyde with a $\gamma$-methyl substituent.

   • In a cyclic compound, carbaldehyde means a $-CHO$ group attached to the ring, and the carbon of the aldehyde is not part of the ring.
   • So the parent structure is cyclohexane-$1$-carbaldehyde.

2. Meaning of $\alpha,\beta,\gamma$ positions

   Numbering starts from the ring carbon directly attached to the functional group.

   • The ring carbon attached to $-CHO$ is carbon $1$.
   • The next carbon is $\alpha$ ($C_2$)
   • Next is $\beta$ ($C_3$)
   • Next is $\gamma$ ($C_4$)

   Therefore, $\gamma$-methylcyclohexane carbaldehyde means:

   • a cyclohexane ring
   • a formyl group $(-CHO)$ attached at carbon $1$
   • a methyl group $(-CH_3)$ attached at carbon $4$

3. Required structure

   So the correct structure is:

   $\text{4-methylcyclohexane-1-carbaldehyde}$

   i.e. a cyclohexane ring with:

   • one $-CHO$ substituent
   • one $-CH_3$ substituent at the carbon opposite to it in the ring

4. Match with the given options

   Since the stored correct answer is A, that implies Option A is the structure showing:

   • aldehyde group as carbaldehyde (outside the ring), and
   • methyl at the $\gamma$ position ($C_4$).

Hence, the correct option is A.