To complete a circuit, two resistors must be connected between points X and Y, as illustrated. These resistors may be arranged either in series or in parallel. Which arrangement of resistors gives the smallest resistance between X and Y?
- A20 and $40\,\Omega$, parallel
- B40 and $100\,\Omega$, parallel
- C20 and $40\,\Omega$, series
- D40 and $100\,\Omega$, series