2. The monotonic decreasing interval of the function $y=\log _{\frac{1}{2}}\left(2 x-x^{2}\right)$ is ( ).
(A) $(0,2)$
(B) $[1,+\infty)$
(C) $[1,2)$
(D) $(0,1]$
2.D.

Determine the conclusion based on the monotonicity of composite functions.