Which of the following is not explained by hyperconjugation?

Hyper conjugation :-
When a sigma $\mathrm{C}-\mathrm{H}$bond of ${\mathrm{sp}}^3$ hybridised carbon is in conjugation with $\mathrm{\pi }$ bond at $\mathrm{p}-$orbital, half filled $\mathrm{p}-$orbital or vacant $\mathrm{p}-$orbital, then the bond pair ${\mathrm{e}}^{-}$ of sigma $\mathrm{C}-\mathrm{H}$ bond overlap with adjacent $\mathrm{p}-$orbital. This phenomena is called hyperconjugation. Like resonance hyperconjugation is also a stabilising effect but the effect of resonance is more dominating than hyperconjugation, since in resonance only $\mathrm{p}-$orbital ${\mathrm{e}}^{-}$ overlap while in hyperconjugation $\mathrm{\sigma }-$molecule orbitals overlap with $\mathrm{\sigma }-$molecule orbital. * Hyperconjugation is also called no bond resonance.

Hence, the hyperconjugation tells about the stability of free radical, carbocation and alkenes because they have the vacant orbitals and alkene has the $\mathrm{\pi }$ bond.

Hence, the stability order of carbanions is not explained by hyperconjugation.