9. Solving the fractional equation $\frac{2}{x+1}+\frac{5}{1-x}=\frac{m}{x^{2}-1}$ will produce extraneous roots, then $m=$ $\qquad$ .
A. -10 or -4
B. 10 or -4
C. 5 or 2
D. 10 or 4
Answer: A

Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.