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]: The teacher of Nick was a lot smarter than Robert's teacher, because _ teacher has several degrees. (A) Nick (B) Robert
[A]: A


[Q]: The town was only able to find a source of water and not the oil because the _ was scarce. (A) water (B) oil
[A]: B


[Q]: We can not see the letters written on the red shirt but we can see the numbers because the _ are white. (A) letters (B) numbers
[A]:
B