Gaokao Math Practice Question
已知函数 $f(x)=\left\{\begin{array}{l}-x^{2}+2 x, \quad x \leqslant 0 \\ \ln (x+1), \quad x>0, \text { 若 }|f(x)| \geqslant a x, \text { 则 } a \text { 的取值 }\end{array}\right.$ 范围是 （$\qquad$）
- A.$(-\infty, 0]$
- B.$(-\infty, 1]$
- C.$[-2,1]$
- D.$[-2,0]$
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