"It would have been bad manners to make his guests feel foolish or uncomfortable." "Bad manners" means ______.

A．He had given the same speech three times.
B．His speech lasted for an hour.
C．He had made three speeches.
D．The speech was not well written.

A．read it to the audience at once
B．picked it up and checked it quickly
C．took it to the airport in a hurry
D．told the secretary to check it