Instructions: In this task, you're given the title and three arbitrary sentences out of a five-sentence story. You are also given three additional sentence options, a, b, and c, that may or may not belong to the story. Your job is to pick the two options that seamlessly connect with the rest of the story; note that the selected choices may fit into the story at any point. Indicate your selected choices in order, i.e., as 'ab'/'bc'/'ac' and not as 'ba'/'ca'/'cb'. If options are equally plausible, pick the ones that make more sense.
Input: Title: Walt and his mother were cleaning out the garage. Walt tossed a sleeping bag to his mother. She caught the bag, but twisted her back and injured it. Choices: a. He took a shower. b. She underwent major surgery for her back the following week. c. Walt was upset that he had hurt his mother's back.
Output:
bc