Bella can produce either a combination of 60 silk roses and 80 silk leaves or a combination of 70 silk roses and 55 silk leaves. If she now produces 60 silk roses and 80 silk​ leaves, what is the opportunity cost of producing an additional 10 silk​ roses?A. 2.5 silk leaves
B. 10 silk leaves
C. 25 silk leaves
D. 55 silk leaves