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: Spanish. Sentence 1: Kaya wanted to learn Spanish. Sentence 2: Her neighbor was a Mexican who wanted to improve her English. Sentence 3: The two girls agreed to practice and help each other. Sentence 4: Every day they got together to study. Choices: a. That made Anna and her parents both very happy! b. After a few weeks, each was much improved in the others' language!
b

Title: Better Grades. Sentence 1: The brothers took an acting class. Sentence 2: They worked on everything together. Sentence 3: They thought they would get the same grade. Sentence 4: One of the brothers got a better grade than the other. Choices: a. The one with the better grade teased his brother. b. Zach reminded him that it was birthday paper for Jesus.
a

Title: Gemstones. Sentence 1: Tim was with his family on a trip. Sentence 2: They went to a gemstone mine. Sentence 3: After learning about the place they were allowed to mine. Sentence 4: Tim found several nice rocks. Choices: a. He kept them for a long time. b. Gary left and decided to stay in another hotel.
a