2,3-dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?
A. (CH₃)₂CH - CH₂ - CH = CH₂
B. (CH₃)₂C = CH - CH₂ - CH₃
C. (CH₃)₂CH - CH - CH = CH₂
∣
CH₃
D. (CH₃)₃C - CH = CH₂