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(B) The molecule $M$ is a substituted bicyclo[$2.2$.$1$]heptan$-2-$one derivative.The structure has a chiral center at the bridgehead carbon where the

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$2$

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(B) The molecule $M$ is a substituted bicyclo[$2.2$.$1$]heptan$-2-$one derivative.The structure has a chiral center at the bridgehead carbon where the methyl group is attached.Due to the rigid bicyclic structure,the bridgehead methyl group can exist in two configurations relative to the bridge,leading to two enantiomers.Since there are no other chiral centers or geometric isomerism possibilities that are not constrained by the bicyclic ring system,the total number of stereoisomers is $2$.

The total number of stereoisomers that can exist for $M$ is:
$M$ is a bicyclic ketone with a methyl group at the bridgehead and two methyl groups at the bridge carbon.

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The total number of stereoisomers that can exist for $M$ is:$M$ is a bicyclic ketone with a methyl group at the bridgehead and two methyl groups at the bridge carbon.