Two masses, $M$ and $m$, are joined by an inextensible string that runs over a frictionless pulley. Mass $M$ is placed on a frictionless slope, as illustrated. The slope makes an angle $\theta$ with the horizontal. At first, the two masses are held at rest, and they are then released. Mass $M$ travels down the slope. Which expression is necessarily true?
- A$\sin \theta < \dfrac{m}{M}$
- B$\cos \theta < \dfrac{m}{M}$
- C$\sin \theta > \dfrac{m}{M}$
- D$\cos \theta > \dfrac{m}{M}$