Which One of the Following Is Enforceable

Multiple Choice

Which one of the following is enforceable?

A) An ad in the paper promises to pay $5 for the return of a lost ring,but the person who finds and returns the ring never saw the offer in the newspaper.
B) Mr.Baker was so sick of an old chair that,when Mr.Venson offered him $10 for it,he agreed (i.e.,promised to sell it to him) ,although the market value of the chair was $80.
C) Ms.Jones promised to pay an additional $1 to Mr.Wood if he finished the existing contract on time,according to the terms of the contract.
D) Mr.Ho promised to give his needy friend,Mr.Jahn,$1.
E) Ms.Goode promised to send $10 to Mr.Paul,who kindly came and warned her when he saw a tow truck approach her car.