Write the next sentence in the following story.

How to act serious
Wear a serious facial expression.
Lower your eyebrows slightly, but do not allow them to slant inward. This can make you look angry.

OPT:
(a). You should also wrinkle your brow, giving you the appearance of being deep in thought, and squint your eyes slightly. It also may benefit you to keep a straight face..
(b). Dress in appropriate clothes for an event. You may go to a given venue and expect an angry effect, but acting serious is better than acting composed and professional..
(c). Keep your arms uncrossed and let your shoulders roll back slightly while you raise your chin. This will help give this impression of a bored or joking person..
(d). Equally important: smiling and showing your teeth can make you look like your parents are plotting to do something cruel or forbidden, which you may or may not take lightly. Do not smile if you would like... The answer should be
(a).