please answer ASAP

Which of the following would best satisfy the requirements of a good legal offer? Select one: a. "I'll get your suit for you tomorrow from the drycleaner." b. "I'll pay you $75 in trade for your green bike." "I'll pay you at least $4,000 for your greyhound dog, Hypersonic, and even more if the dog is blessed with good fortune." d. "The purchaser will pay $11,000 for one of the seller's used cars, the exact model to be determined at a later date." C