Lily's mother asks Lily to buy 4 pounds of flour from the grocery store. The weights on the flour packages are in ounces. The ratio of pounds to ounces is 1 : 16. What is the amount of flour in ounces that Lily needs to buy? A. 64 ounces B. 16 ounces C. 4 ounces D. 0.25 ounces
