When Her Daughter Misbehaves, Olivia Has Her Daughter Sit Quietly

When her daughter misbehaves, Olivia has her daughter sit quietly by herself for a few minutes without being allowed to play with other children or toys. What else should Olivia do to ensure that the time-out is effective in reducing her daughter's unwanted behavior?

A) She should warn her daughter that a time-out would occur if misbehavior continues.
B) She should also use punishment to make the time-out more effective.
C) She should not tell her daughter how long the time-out will last.
D) She should not remind her daughter why the time-out is occurring.