If you flip the light switch in your living room and nothing happens, what might be a good hypothesis to explain the absence of light?
A) The circuit breaker for the living room might be the "off" position.
B) Electricity sometimes flows backward in a wire, preventing the light from shining.
C) You might have made too many telephone calls this month, thereby reducing the amount of electricity in your lines.
D) The air conditioner is also running upstairs, and it might be using all of the electricity available in your house at the moment.
Answer: A
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