Antoine is conducting an experiment on the effects of room color on people's ability to concentrate. The dependent variable would be the

One reason adolescents' nutritional habits may be poor is:

lack of media attention to the importance of good nutrition. misunderstanding about what is and is not healthy food. altered taste buds due to hormonal surges. anxiety about their body image.

The idea that at least some of our activities must be motivated by their inner drives and choices, rather than by external factors, reflects ____

a. entity theory b. self-determination theory c. action identification theory d. the status quo bias