A battery is attached to a circuit made up of six resistors, as shown. The potential differences across five of the resistors are marked on the diagram. What is the potential difference across resistor $R$?
- A$4.4\,\text{V}$
- B$4.6\,\text{V}$
- C$6.6\,\text{V}$
- D$11.2\,\text{V}$