The statement that is true here is:
c.
Max has made a counter-offer.
Step-by-step explanation:
Max here is giving another offer on the above of the offer that is given by Allie the travel agent.
He is trying to bargain himself into a better position in the deal and then to seal it as he can see an obvious profit in the game.
Thus, this counter deal that is offered puts both parties in a situation of advantage and either of the two can make things final or obstruct the deal spending on if they would want this deal to take place on the given terms or would want better terms.