When Distinguishing an Offer from an Invitation to Negotiate,which of the Following

When distinguishing an offer from an invitation to negotiate,which of the following is accurate?

A) Whether an offer in fact existed depends solely on whether an acceptance of the alleged offer was made immediately so that the offeror knew he or she was bound.
B) Whether an offer in fact existed is a mixed question of law and fact.
C) Whether an offer in fact existed is a question of law.
D) Whether an offer in fact existed is a question of fact.
E) Whether an offer in fact existed depends solely on whether the alleged offer included a specific price.