Here it is
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Molecular Orbital theory explanation for the stability of more substituted alkene?
In alkyl groups ,C-H (and C-C) sigma bonds on the alkyl carbon which can overlap with the empty antibonding pi-orbitals of the double bond. Mixing together the full orbital of the sigma bond with the empty pi? orbital results in a slight lowering of energy.

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MOT picture shows the two molecular orbitals are formed by the mixing of the filled sigma C-H orbital with the empty pi? orbital, in which one molecular orbital is lower in energy and one molecular orbital higher in energy.   
The pair of electrons from the C-H bond occupy the lower molecular orbital, representing a slight lowering of energy.

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However in carbocations, hyperconjugation is taking place between sigma bond of C-H and empty p orbital of Carbon with positive charge.
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So answer is d