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(C) Step $1$: The terminal alkyne reacts with $NaNH_2$ in $NH_3$ to form a sodium acetylide intermediate,which then undergoes an $S_N2$ reaction with

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$1-$(cyclohex$-1-$en$-1-$yl)prop$-1-$ene (cis isomer)

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(C) Step $1$: The terminal alkyne reacts with $NaNH_2$ in $NH_3$ to form a sodium acetylide intermediate,which then undergoes an $S_N2$ reaction with $CH_3Br$ to form the methylated alkyne $(A)$,which is $1-(cyclohex-1-en-1-yl)prop-1-yne$.Step $2$: The hydrogenation of the alkyne $(A)$ using Lindlar catalyst $(H_2/Pd/BaSO_4)$ is a stereoselective reaction that adds hydrogen across the triple bond in a $syn$-fashion,resulting in the formation of the $cis$-alkene $(B)$,which is $1-(cyclohex-1-en-1-yl)prop-1-ene$ (cis isomer).

The product $(B)$ is:

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