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