Puzzles and Brain Teasers Pop Quiz

Sam went to bed at 8:30pm, and wound up his old wind-up alarm clock. He set it to wake him up at 9:00am. How many hours sleep did Sam get?
Choose the right answer:
Option A 5 hours
Option B 12 hours, 30 minuten
Option C 30 minuten
Option D None of these options
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