He congratulated you . . . . . . . . your promotion.

In this context, the correct preposition to use is "on" when expressing congratulations for a specific event or achievement. So, it should be "He congratulated you on your promotion."

Option A, "for," is often used with "congratulate" but is not the most suitable choice in this context.

Option B, "of," and Option D, "in," are not the appropriate prepositions to use in this context.

Therefore, the correct sentence is: "He congratulated you on your promotion."