If $$y=y(x)$$ ) satisfies the differential equation $$8\sqrt{x}(\sqrt{9+\sqrt{x}})dy=(\sqrt{4+\sqrt{9+\sqrt{x}}})^{-1}dx$$, x>0 and $$Y(0)=\sqrt{7}$$, then y(256)=

A

3

B

9

C

16

D

80