The diagram illustrates a trolley that is used to carry a load of $400\,\text{N}$. To keep the trolley balanced in the position shown, a force $F$ acting vertically downwards is required. The centre of mass of the trolley lies vertically above the pivot. What is the value of $F$?
- A$133\,\text{N}$
- B$150\,\text{N}$
- C$300\,\text{N}$
- D$400\,\text{N}$