Which of the Following Is True Regarding Distinguishing an Offer

Which of the following is true regarding distinguishing an offer from an invitation to negotiate?

A) Whether an offer in fact existed is a question of law.
B) Whether an offer in fact existed is a question of fact.
C) Whether an offer in fact existed is a mixed question of law and fact.
D) Whether an offer in fact existed depends solely on whether the alleged offer included a specific price.
E) 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.