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: English Teacher. Sentence 1: Dave wanted to be an English teacher. Sentence 2: And he also had dreams of traveling. Sentence 3: He found a teaching position in China. Sentence 4: So he took the position. Choices: a. But he had severe trouble getting used to the foreign country. b. Later, someone threw the ball at his face and he had trouble seeing.
a