Yes; this is the correct answer:
Answer choice: [C]: "<span>Ellos le dijeron todo sobre el accidente."
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17. False, it happened at night.
18. True
19. Not Sure, Sorry!
20. False, the candle WAS lit.
He is c. El dentista, since they're talking about someone who takes care of the client's teeth, so this means he is is the dentist (el dentista).
Good luck!