Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?

Question

CH₃ $-$ CH $=$ CH $-$ CH₃

CH₃ $-$ C$ \equiv $C $-$ CH₃

CH₂ $=$ CH $-$ CH₂ $-$ C$ \equiv $CH

CH₃ $-$ CH₂ $-$ CH₂ $-$ CH₃

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