Read the following context and choose the best option to answer the question.
Context: In the meantime I ' m sitting in the lounge passing time before my class starts at one . So far so good I had a version of this class in under grad and I got an " A " then . It concerns me a bit that there will be group projects and there are 3 people that do n't speak English well and they seem to give the impression that they know it all .
Question: Why does having taken a version of this class in undergrad make the speaker confident about the current class ?
Options: 
A. Because , since they 've already taken the course once , they wo n't have to buy another textbook
B. Because they had the same professor for both classes so they know how he grades papers
C. Because they saved the answers to all of the tests and quizzes and should be able to pass once more
D. None of the above choices .


D