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A: $$Ph-C \equiv C-Ph + 2H_2 \xrightarrow{Pd/C} Ph-CH_2-CH_2-Ph$$
B: $$Ph-C \equiv C-Ph + H_2 \xrightarrow{\text{Lindlar's}} \text{cis-}Ph-CH=CH-Ph$$
C: $$Ph-C \equiv C-Ph \xrightarrow{Li/liq. NH_3} \text{trans-}Ph-CH=CH-Ph$$
D: $$Ph-C \equiv C-Ph \xrightarrow{LiAlH_4} \text{No Reaction}$$
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