Dominick is in charge of ordering supplies for harry's hamburger stand. hamburger buns come in packs of 12 and frozen hamburgers patties comes in packages of 20. he must have the same amount of rolls as patties. what is the least numbers of packages of each that he must order?

a. 2 packages of buns and 1 package of patties
b. 2 packages of buns and 2 packages of patties
c. 5 packages of buns and 3 packages of patties
d. 4 packages of buns and 3 package of patties

my sister is stumped w/ this question, i already know the answer though, i want to make sure i'm 100% correct.