When Drew Gave the Toast at His Best Friend's Wedding

When Drew gave the toast at his best friend's wedding reception, he failed to notice the shocked looks as he told some off-color stories about the happy couple's dating life. What quality of decorum did Drew violate in this example?

A) The toast was too long.
B) The toast did not reflect the speaker's feelings.
C) The audience did not like the speaker.
D) The speech was too informal for the occasion.