The diagram shows part of a circuit used to control street lamps automatically, switching them on and off. As evening falls, it becomes dark. Which row gives the effect on the resistance of the light-dependent resistor (LDR) and on the potential difference (p.d.) across it?
- Aresistance of LDR decreases; p.d. across LDR decreases
- Bresistance of LDR decreases; p.d. across LDR increases
- Cresistance of LDR increases; p.d. across LDR decreases
- Dresistance of LDR increases; p.d. across LDR increases