Account true balances can change because of the passage of time.

Tonya was confused. In order to motivate Sam, one of her employees, she began to pay him for work that she knew he liked to do and for which he was previously not paid. However, she noticed that his overall level of motivation appeared to decrease. The motivation theory that best explains this example is

a. operant conditioning. b. distributive justice. c. cognitive evaluation theory. d. Maslow theory. e. Theory X.

The most scientifically valid research is ________ research

A) observation B) focus group C) survey D) behavioral E) experimental