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]: Though they had been hanging out together, Derrick came down with a fever while Samuel didn't. _ always had a strong immune system. (A) Derrick (B) Samuel
[A]: B


[Q]: Derrick thought the letter Logan wrote was way too formal, because _ prefers using a casual style. (A) Derrick (B) Logan
[A]: A


[Q]: Mary wanted to buy a house from Natalie, but _ could not pay market value. (A) Mary (B) Natalie
[A]:
A