Which frappuccino variant requires 2 pumps of caramel syrup in the recipe?

The tall caramel frappuccino is the correct choice because it specifically requires 2 pumps of caramel syrup as part of its standard recipe. Each size of frappuccino has a different amount of syrup used to maintain the appropriate flavor balance for that drink size. The tall, being the smallest serving in this selection, is designed to have 2 pumps of caramel syrup to ensure that the drink maintains its rich caramel flavor without being overly sweet or diluted.

In contrast, the grande and venti sizes would use a greater number of pumps of caramel syrup, aligned with their larger volumes to ensure the flavor is sufficiently pronounced. The tall classic chai creme frappuccino is not relevant here, as it does not contain caramel syrup in its recipe at all. Thus, the tall caramel frappuccino is the only option that requires exactly 2 pumps of caramel syrup.