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(A) In $cis-1-Ethyl-3-methylcyclohexane$,both substituents are on the same side of the cyclohexane ring,leading to steric repulsion between the ethyl

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$B$ is more stable

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(A) In $cis-1-Ethyl-3-methylcyclohexane$,both substituents are on the same side of the cyclohexane ring,leading to steric repulsion between the ethyl and methyl groups in the chair conformation.In $trans-1-Ethyl-3-methylcyclohexane$,the substituents are on opposite sides of the ring,which minimizes steric hindrance.Therefore,the $trans$ isomer is more stable than the $cis$ isomer.

Compare the stabilities of the following two compounds :
$A$ : cis-$1$-Ethyl-$3$-methylcyclohexane
$B$ : trans-$1$-Ethyl-$3$-methylcyclohexane

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Compare the stabilities of the following two compounds :$A$ : cis-$1$-Ethyl-$3$-methylcyclohexane$B$ : trans-$1$-Ethyl-$3$-methylcyclohexane