The diagram represents a wooden beam $PQ$ fixed to a wall with a pivot at $P$ and held level by a vertical rope fastened at $Q$. A box has been positioned on the beam. Which changes must decrease the tension in the rope at $Q$?
- ADecrease the mass of the box and move it towards $P$.
- BDecrease the mass of the box and move it towards $Q$.
- CIncrease the mass of the box and move it towards $P$.
- DIncrease the mass of the box and move it towards $Q$.