As per the objective test of offer:

A. Once the parties have by all outward appearances agreed in the same terms on the same subject-matter, then neither can, generally, rely on some unexpressed qualification or reservation to show that he had not in fact agreed to the terms to which he had appeared to agree.

B. Once the parties have mentally decided to agree in the same terms on the same subject-matter, then neither can generally rely on any unexpressed reservation to show that she had not in fact agreed on the same terms in the same sense.

C. Once the parties have been forced to agree, then not with standing the fact that outwardly they may not have appeared to agree, they can in fact be bound by the terms and subject-matter of the agreement

D. None of the above

Answer: Option A