Which Reaction Sequence Would Convert Cis-2-Butene to Trans-2-Butene

Multiple Choice

Which reaction sequence would convert cis-2-butene to trans-2-butene?

A) Br₂/CCl₄; then 2 NaNH₂; then H₂/Ni₂B(P-2)
B) Br₂/CCl₄; then 2 NaNH₂; then Li/liq.NH₃
C) H₃O⁺,heat; then cold dilute KMnO₄
D) HBr; then NaNH₂; then H₂,Pt
E) None of these choices.