Identify C in the following series `C_(3) H_(7)Iunderset(Alc)overset(KOH)toAunderset(Delta)overset(NBS)toBunderset(Alc)overset(KCN)toC.`
A. `(CH_(3))_(2) CH-CN`
B. `CH_(2) = CH - CH_(2) CN`
C. `Br-CH=CH-CN`
D. `CH_(2) = CH - underset(Br)underset(|)(C)HCN`
