1
The diagram below shows an electric circuit with three identical bulbs.

What happens to bulb X and bulb Z if bulb Y is spoilt?
| Bulb X | Bulb Z | |
| A | Lights up | Lights up |
| B | Lights up | Does not light up |
| C | Does not light up | Does not light up |
| D | Becomes dimmer | Becomes dimmer |
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A
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B
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C
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D