Given the task definition, example input & output, solve the new input case.
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.
Example: Title: Marcus Buys Khakis. Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Choices: a. Marcus was happy to have the right clothes for the event. b. He left in a huff for having his ideas mocked.
Output: a
Marcus is buying clothes for a business event and not presenting an idea.

New input case for you: Title: movie theater. Sentence 1: John wanted to create his own speaker system in his house. Sentence 2: He wanted to experience the movies in high fidelity sound. Sentence 3: He bought a receiver but did not know how to set it up. Sentence 4: He bought a speaker system but he did not know how to set it up. Choices: a. John requested a service installation and finally he had set it up. b. He told himself he would just smoke half of it.
Output:
a