Their classmate, Natalie, just bought 1 package of 21 binders. She also bought 1 package of 30 pencils. She wants to use all of the binders and pencils to create identical sets of office supplies for her classmates. What is the greatest number of identical sets Natalie can make using all the supplies? (6.NS. B.4) A. 10 B. 3 C. 5 D. 7