If $$(5 \sqrt 5 x^3 - 3 \sqrt 3 y^3) \div (\sqrt 5 x - \sqrt 3 y) = (Ax^2 + By^2 + Cxy),$$ then what is the value of $$(3A - B - \sqrt 15 C)$$ ?

A

-3

B

-5

C

8

D

12