Eton and Fiona Sign a Contract by Which Eton Agrees

Multiple Choice

Eton and Fiona sign a contract by which Eton agrees to deliver a washing machine on July 31 in exchange for Fiona's promise to pay the $500 pur?chase price on July 31. The delivery of the washing machine and the payment of $500 are ex?amples of

A) conditions precedent.
B) concurrent conditions.
C) conditions subsequent.
D) illegal conditions.