PREPOSITION 'to' is used 'to show the PERSON or thing that RECEIVES something'.E.g. I'll EXPLAIN to you where everything goes.The preposition 'about' is used to refer 'in connection with somebody/something'.E.g. Tell me about the incident.According to the rule and example that are given above, 'to, about' is the correct choice for the blank.Complete SENTENCE- He lied to me about the incident.