Cho 

Câu hỏi: Cho $S={\int }_0^{\frac{\mathrm{\pi }}{2}}\left(2x-1-\sin x\right)dx$.Biết $I=\frac{{\mathrm{\pi }}^2}{\mathrm{a}}-\frac{\mathrm{\pi }}{b}-1$ Cho

A. (1),(2),(3)

B. (2),(3),(4)

C. (1),(2),(4)

D. (1),(3),(4)