Ms. Callahan had 250 sheets of paper. She used 6 sheets of paper. She then gave each student 3 sheets of paper.
Which expression represents the number of sheets of paper Ms. Callahan had left after she gave paper to n students>
A) 250 - 9n
B) 250 - 3n
C) 250 - 9 - 3n
D) 250 6 - 3n