Count the number of hydrogens on sp3 carbons directly attached to the two sp2 carbons of the alkene shown (the number of hyperconjugative C-H bonds).

Answer: D

The alkene shown is 2-methylbut-2-ene. Its three methyl groups are attached to the sp2 carbons and contribute 3 hydrogens each. So the total is 9 (checked with RDKit).

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