What Have Most States Done with Regard to Unsolicited Merchandise

What have most states done with regard to unsolicited merchandise received from a seller?

A) Most states have passed laws providing that unsolicited merchandise does not have to be returned and the recipient may keep it as a gift, with no contract being formed.
B) Most states have passed laws providing that unsolicited merchandise must be returned to the seller within 7 days.
C) Most states have passed laws providing that unsolicited merchandise must be returned to the seller within 10 days.
D) Most states have passed laws providing that unsolicited merchandise must be returned to the seller within 30 days.
E) Most states have passed laws providing that unsolicited merchandise must be returned to the seller within 60 days.