Contingent contract means:

A. A suit entrusted to any person to abide by the result of any game or other uncertain event on which may wager is made

B. A contract to do or not to do something, if some event, collateral to such contract, does or does not happen

C. Agreements which are not certain, or capable of being made certain

D. Every agreement, by which any party thereto is restricted absolutely from enforcing his rights under or in respect of any contract

Answer: Option B