The circuit diagram includes a $4.0\ \Omega$ resistor and an $8.0\ \Omega$ resistor connected to a $6.0\ \text{V}$ battery. What is the potential difference (p.d.) across the $4.0\ \Omega$ resistor?
- A$0.5\ \text{V}$
- B$2.0\ \text{V}$
- C$4.0\ \text{V}$
- D$6.0\ \text{V}$