The stability order of the given alkenes is

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(D) The stability of alkenes in fused ring systems is governed by Bredt's rule and the degree of substitution at the double bond.Structure $III$ is a

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$III > I > II$

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(D) The stability of alkenes in fused ring systems is governed by Bredt's rule and the degree of substitution at the double bond.Structure $III$ is a tetrasubstituted alkene (specifically,a tetrasubstituted double bond at the bridgehead position),which is highly stable due to hyperconjugation and inductive effects.Structure $I$ is a trisubstituted alkene.Structure $II$ is a disubstituted alkene.Greater substitution leads to higher stability.Therefore,the correct order of stability is $III > I > II$.

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