<If he was to decide to go to Wall Street>, I, for one, would recommend that he plan to go to J. P Morgan.

A) If he was to decide to go to Wall Street,

B) If he were to decide to go to Wall Street,

C) Had he decided to go to Wall Street,

D) In the event that he decides to go to Wall Street,

E) Supposing he was to decide to go to Wall Street,