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.

[Q]: Title: Merry Go Round. Sentence 1: Sally could not decide between the white horse and pink bunny. Sentence 2: Choosing the right animal on the merry go round was serious business. Sentence 3: She finally decided on the pink bunny. Sentence 4: Her grandmother realized she wanted to ride the horse as much. Choices: a. They took lots of pictures of the animals. b. So she got her a ticket for a second ride.
[A]: b

[Q]: Title: First Rodeo. Sentence 1: Tom had never gone to a rodeo before. Sentence 2: His friends invited him to one. Sentence 3: He wound up really enjoying it. Sentence 4: Tom went back often. Choices: a. Eventually he even got to be part of some shows. b. Aaron ate the food later.
[A]: a

[Q]: Title: It's Green. Sentence 1: Trouble brewing at the Olympic games. Sentence 2: Water in several pools has turned green. Sentence 3: There are now two pools that have bright green water. Sentence 4: The water is supposed to be azure in color. Choices: a. I drove on the highway and everything turned out fine. b. Olympic officials are trying to find out the cause.
[A]:
b