Answer:
A, competing in a marathon
Explanation:
Wakefulness is a brain state, a conscious state where an individual is able to think in a cognitive manner and responds to the external world.
The opposite of wakefulness is being asleep, where the external input to the brain is not being processed.
Jemma, competing in a marathon is perfectly aware of her actions and her thinking is clear. In all the other examples, the people are unconscious, or in a sleep or a sleep-alike state (sleepwalking), where their brain is not involved in making decisions or processing information.
