Which of the following reagents converts acid chloride to aldehyde...

The conversion of an acid chloride to an aldehyde is known as the Rosenmund reduction.

The reagent used for this transformation is hydrogen gas in the presence of a palladium catalyst supported on barium sulfate ($\text{H}_2$/Pd-$\text{BaSO}_4$).

Barium sulfate acts as a catalytic poison, which decreases the activity of palladium and prevents the further reduction of the newly formed aldehyde into a primary alcohol.

Strong reducing agents like $\text{LiAlH}_4$ and $\text{NaBH}_4$, as well as $\text{H}_2$/Pt, reduce acid chlorides completely to primary alcohols.

Answer: $\text{H}_2$/Pd-$\text{BaSO}_4$