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Let \( f(\mathrm{x})=\sin ^{2} \mathrm{x}-(\mathrm{a}-1) \sin \mathrm{x}+2(\mathrm{a}-3) \)
\( \mathrm{P} \)
On the basis of above information, answer the following questions :
W If \( \mathrm{f}(\mathrm{x})=0 \) have two real roots in \( (0, \pi) \), then \( \mathrm{a} \in \)
(A) \( (1,2) \)
(B) \( (3,4) \)
(C) \( (3,4) \cup\{5\} \)
(D) \( (3,5) \)
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