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.
Q: Title: Walter was worried because his dog was showing a lot of aggression. The dog recently began snapping at other dogs and even people. Some medication got rid of the fleas and the dog's bad mood, too. Choices: a. When they returned home, they decided to buy a lake house. b. The vet discovered that the dog was suffering a flea infestation. c. Walter consulted with his veterinarian.
A:
bc