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".

[Q]: Maria learned how to make pineapple upside down cake from Carrie, but _ could never quite get hers to taste the same. (A) Maria (B) Carrie
[A]: A


[Q]: The librarian wanted to hide the book on the shelf but the _ was too large. (A) book (B) shelf
[A]: A


[Q]: Mary kept hounding Katrina to work harder at school because _ got bad grades in science. (A) Mary (B) Katrina
[A]:
B