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: Helper. Sentence 1: Anna's teacher picked her as class helper. Sentence 2: She was happy at first. Sentence 3: But the rest of the class called her a teacher's pet. Sentence 4: They picked on her until she was miserable. Choices: a. She reluctantly agreed to do so. b. Anna asked the teacher to pick another helper!
[A]: b

[Q]: Title: The Train is Cheaper. Sentence 1: Nigel was traveling to visit his aunt. Sentence 2: He was looking at flights but they were all too expensive. Sentence 3: Then he saw that train rides were much more affordable. Sentence 4: He bought his ticket and hoped for the best. Choices: a. For the rest of his life, Jim lied for his own benefit. b. Luckily the train ride was not too bad at all.
[A]: b

[Q]: Title: The evil dad. Sentence 1: A man took his fussy 4 month old baby for a drive. Sentence 2: Later on that day he called the cops claiming someone took his baby. Sentence 3: The cops didn't believe the man and arrested him. Sentence 4: He confessed to killing the baby by accident and buried her. Choices: a. The evil dad was charged and is now serving life in prison. b. Someone had dropped a cigarette but in the bottle.
[A]:
a