A teacher builds a circuit with three $1.5\,\text{V}$ cells and two $20\,\Omega$ resistors arranged in series. Which row shows the total electromotive force (e.m.f.) of the cells and the total resistance of the resistors?
- A$1.5\,\text{V}$ and $10\,\Omega$
- B$1.5\,\text{V}$ and $40\,\Omega$
- C$4.5\,\text{V}$ and $10\,\Omega$
- D$4.5\,\text{V}$ and $40\,\Omega$