Carly wants to buy some notebooks that cost $3.50 each. She has $20 to spend. She set up this inequality to find out how many notebooks she can buy. 3.5n < 20 Which set of numbers represents all possible numbers of notebooks Carly could buy? A. {0, 1, 2, 3, 4} B. {0, 1, 2, 3, 4, 5} C. {0, 1, 2, 3, 4, 5, 6} D. {0, 1, 2, 3, 4, 5, 6, 7}