Given the task definition and input, reply with output. In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Title: Tickets. Sentence 1: Joslyn's parents could only afford for her to go into Disneyland. Sentence 2: They had just enough money for one hotel night and her admission. Sentence 3: They watched her walk into the entrance and stood around. Sentence 4: They would talk to her via a cheap prepaid phone. Choices: a. A stranger who watched this unfold, offered them two free tickets. b. The dance went off without a hitch.
a