Mallory and Steve are parents of a difficult temperament infant. In response to the child's temperament, they become less available and less responsive. As a result, their child becomes more difficult to handle. This is an example of

Percy's coworker frustrates her immensely

While in meetings, her coworker disagrees with just about everything that is suggested and prevents meetings from adjourning because he doesn't think they have really finished the discussion. She describes him as antagonistic and difficult to work with. Based on the five-factor model, Percy's coworker would likely score quite low on the _____ scale. Fill in the blank with correct word

Which of the following has been suggested as a cause or trigger for insomnia?

a. Stress b. Depression c. Use of sleeping pills d. All of the above