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(D) The stability of alkenes is determined by the number of hyperconjugative structures (alpha-hydrogens) and steric hindrance. $(X)$ is $2$-ethyl$-1$

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$X > Y > Z$

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(D) The stability of alkenes is determined by the number of hyperconjugative structures (alpha-hydrogens) and steric hindrance. $(X)$ is $2$-ethyl$-1$-butene, which has $5$ alpha-hydrogens. $(Y)$ is $trans$-$3$-hexene, which is a disubstituted alkene with $4$ alpha-hydrogens and less steric hindrance. $(Z)$ is $cis$-$3$-hexene, which is a disubstituted alkene with $4$ alpha-hydrogens but more steric hindrance than the trans isomer. According to Saytzeff's rule and stability trends, highly substituted alkenes are more stable. $(X)$ has $5$ alpha-hydrogens, making it more stable than the disubstituted isomers $(Y)$ and $(Z)$. Between $(Y)$ and $(Z)$, the $trans$ isomer $(Y)$ is more stable than the $cis$ isomer $(Z)$ due to lower steric repulsion. Therefore, the stability order is $X > Y > Z$.

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