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已知函数$f(x)=\sin(\omega x+\varphi)(\omega$为正整数,$0 < \varphi < \pi)$在区间$\left(\dfrac{\pi}{4},\pi\right)$上单调,且$f(\pi)=f\left(\dfrac{3\pi}{2}\right)$,则$\varphi=$(  )
A. $\dfrac{\pi}{6}$     B. $\dfrac{\pi}{4}$     C. $\dfrac{\pi}{3}$     D. $\dfrac{2\pi}{3}$         
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