Final answer:
The statement classifying motivation theories solely into needs theories and justice theories is false; there are multiple diverse theories explaining human motivation, including Maslow's hierarchy of needs.
Step-by-step explanation:
The assertion that the main theories of motivation fall into one of two categories: needs theories and justice theories, is false. There are various theories of motivation, including but not limited to biological, psychological, and social forces.
For instance, Abraham Maslow's hierarchy of needs is a widely known model within motivational psychology, which proposes that human behavior is motivated by a series of hierarchical needs, ranging from basic physiological needs to self-actualization.
Other theories include drive reduction theory, self-efficacy, and various social motives. The field of motivation is rich and diverse, with several key theories explaining why we engage in certain behaviors.