Fill in the blank (_) in the following sentence from the following choices.
Sentence: Betty hardly ever cleaned their fish tank but Christine cleaned theirs religiously. _ came home to find all their fish were well.

Choice 1: Betty hardly ever cleaned their fish tank but Christine cleaned theirs religiously. Betty came home to find all their fish were well.
Choice 2: Betty hardly ever cleaned their fish tank but Christine cleaned theirs religiously. Christine came home to find all their fish were well.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.