While Researching His Speech,Gabe Found a Tragic Story About a Young

While researching his speech,Gabe found a tragic story about a young girl who died from a drunken driving accident.In presenting his speech,Gabe told the story as if this girl was his sister.The speech was quite moving and afterward everyone told Gabe how sorry they were for his family.At this time,he told them it wasn't really his sister but thought that telling it that way was more effective for this speech.Why is this unethical?

A) Gabe violated an ethical principle that requires speakers to avoid plagiarism.
B) Gabe violated an ethical principle that requires speakers to be tolerant of differences.
C) Gabe violated an ethical principle that requires speakers to be honest.
D) Gabe violated an ethical principle that requires speakers to do their own work.