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

Question

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The reaction sequence involves adding two steps of NaNH2 (sodium amide) to convert 2-butene into its corresponding trans isomer. The first step deprotonates the double bond to give the anionic intermediate. The second step reprotonates the intermediate with NH3 (ammonia) and the solvent to give the trans isomer. The initial step of adding Br2/CCl4 to 2-butene is to create a stereoselective mixture where the cis isomer predominates. The remaining choices do not involve the use of sodium amide or the stereoselective addition of Br2/CCl4, or they involve different reactants that do not lead to the desired products.

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