The hyperconjugative stabilities of tert-butyl cation and `2`-butene, respectively, are due to

Options

A. ` sigma rarr " p (empty) and "sigma rarr pi^(ast) "electron delocalisations"`
B. `sigma rarr sigma^(ast) " and " simga rarr pi " electron delocalisation"`
C. `sigma rarr p "(filled) and " sigma rarr pi " electron delocalisations "`
D. `p " (filled)" rarr sigma^(ast) " and "sigma rarr pi^(ast) " electron delocalisations."`

Answer

A

Explanation