Which of the Following Could Be Used to Synthesize 2-Bromobutane $\to$

Which of the following could be used to synthesize 2-bromobutane?

A) CH₃CH₂CH=CH₂ + Br₂(aq) $\to$
B) CH₃CH₂C $\equiv$ CH₃ + HBr $\to$
C) CH₃CH₂C $\equiv$ CH + HBr $\to$
D) CH₃CH₂C $\equiv$ CH + Br₂ $\to$
E) More than one of these choices.