The most stable carbocation, among the following is

Options

A $\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3$
B $\mathrm{CH}_3-\mathrm{CH}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_3$
C $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
D $\mathrm{CH}_3-\mathrm{CH}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2$

C. $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$

\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{H} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3

is the most stable carbocation among the given carbocations. It is because the number of

\alpha

\mathrm{H}

atom attached to carbocation is maximum in

\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3

. Thus, it has maximum number of hyperconjugating structure hence, it is most stable.