I don't know what your answer choices were but "stingy" sounds like a good word to fit in the sentence.
Well, you most likely will have to take it 3 times, if you tense up, it will hurt alot, on the first time mostly. But afterwards, it wont. So Dont tense up, and dont get stressed. Its not very bad really. The first time is bad, but you wont feel it much.
Explanation:
ability to do or act; capability of doing or accomplishing something.