`2,3-`Dimethyl`-2-`butene can be prepared by heating which of the following compounds with a strong acid ?
A. `(CH_(3))_(3)C-CH=CH_(2)`
B. `(CH_(3))_(2)CH-underset(CH_(3))underset(|)(CH)-CH=CH_(2)`
C. `(CH_(3))_(2)C=CH-CH_(2)-CH_(3)`
D. `(CH_(3))_(2)CH-CH_(2)-CH=CH_(2)`