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# Hyper conjugation involves overlap of the following orbitals

$(a)\; \sigma- \sigma \\ (b)\; \sigma -\pi \\ (c)\;p-p \\ (d)\;\pi -\pi$

Hyperconjugation involves delocalization of $\sigma$ and $\pi$ bonds orbitals. ie it undergoes $\sigma - \pi$ conjugation.
The kind of delocalization involving sigma electrons of single bond and $\pi$- electrons of multiple bond is called hyperconjugation.
Hence b is the correct answer.