The most plausible reason is that teacher speaks really fast.
Instructors need to adjust their speech and how they deliver it according to the level of knowledge and age of their audiences to avoid issues like students having problems to keep up with the class rythm. So, if the instructor speaks really fast, students may have problems to pay attention and take complete notes about the topics seen in class.
The correct answer is "He tried to write down everything his instructor said".
One of the most common mistakes of taking notes in class is to try to write down everything what the instructor says. It is not possible to write down everything at the same pace as the instructor speaks, and it is a bad habit because the student focuses in writing instead of learning. Roscoe inability to keep up what the instructor says and having a lot of blanks in his notes are common effects of using this bad habit in class.
b because its own need to get the car and the other one is a little bit