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: Learning To Swim. Sentence 1: Olga had been afraid of the water all of her life. Sentence 2: When her grandchildren began to learn to swim she felt it was time. Sentence 3: Olga took lessons at the community center. Sentence 4: Once she got over the fear she picked up the skill rapidly. Choices: a. Heather called her daughter and told her she did not have to drive her. b. Olga surprised her grandchildren by jumping in the pool last week.
[A]: b

[Q]: Title: Girl Friend. Sentence 1: Timmy just started kindergarten. Sentence 2: He's nervous about meeting new people and making friends. Sentence 3: Wednesday he met a girl named Jessie who asked to be his friend. Sentence 4: Timmy had never made friends with a girl before but he agreed. Choices: a. Twelve years later, Timmy and Jesse finish school as best of friends. b. It took a week to save up for replacement headphones.
[A]: a

[Q]: Title: Retirement. Sentence 1: Frank had been working for 30 years. Sentence 2: He finally retired. Sentence 3: He was so excited to relax and spend his days however he wanted. Sentence 4: He enjoyed all his free time. Choices: a. Seth has been living on the streets ever since. b. Retirement was great!
[A]:
b