The nephew in the case ofHamer vs. Sidwaywas entitled to collect from his uncle's estate because

A.Even though his health benefitted from the contract, he suffered a legal detriment by giving up his legal right to do certain things.

B.Benefit to the promisee is sufficient consideration for a contract.

C.The agreement was in writing and every promise in writing is enforceable.

D.The doctrine ofipso dipso factorequired payment.