Answer:
Jason was unsure whether to buy the book or Percy's gift.
Step-by-step explanation:
Based on the provided passage, we can see that Jason was conflicted between his want and his need. He wanted to buy the book that he has been waiting for, but also at the same time, he needed to buy a gift for Percy. He had already saved up the money to buy the birthday gift, but the prospect of finally getting the book seems alluring. His want of the book and his friendship contradict each other, both pulling him in. Thus, the central conflict in the passage is that Jason was unsure whether to buy the book or Percy's gift.