In this task, you are given a question containing a blank (_) and two options. You should pick the best option to answer the question. Please answer with "A" or "B".

Erin invited Laura on walks to improve circulation in their feet, since _ already had bad habits of exercising. (A) Erin (B) Laura
B

The bits of sand in clam chowder bothered Justin, but it didn't bother Brian because _ didn't understand that the sand means that it's fresh. (A) Justin (B) Brian
A

At the end of the year, Christine realized why she failed while Mary got A's; _ managed to resist play over studying. (A) Christine (B) Mary

B