With Regard Only to the Requirement of Consideration,which One of the Following

Multiple Choice

With regard only to the requirement of consideration,which one of the following would be a binding contract?

A) an agreement between a contractor and a home owner that the home owner will pay an additional $1000 if the contractor completes the existing contract according to all its terms
B) a promise by Tom to drive a co-worker to Timmins,Ontario
C) a promise to give $10 exchanged for a promise to give a can of pop
D) a written promise,but not under seal,to give John $50 on Saturday
E) a promise by Mr.Brent to pay $25 to John,who found and returned Brent's wallet,which Brent didn't even know he had lost until John delivered it