Three forces act on a block, as shown in the diagram. The resultant force is $6\,\text{N}$ to the right. Which extra force would give a resultant force of $3\,\text{N}$ to the left?
- A$3\,\text{N}$ to the left
- B$9\,\text{N}$ to the left
- C$6\,\text{N}$ to the right
- D$13\,\text{N}$ to the right