The is the most fundamental of motivation theories and begins with a person feeling a need and then the need is transformed into behavior directed toward achieving a goal.

Needs-Goal Theory

Explanation:

The Needs-Goal motivation theory is the most fundamental of the motivation theories for it emphasizes the fact that when a person has a need, that feeling would make him motivated to strive to set the goal of fulfilling that need.

Some of the basic needs of man are met on the basis of this theory. For example, to solve the problem of shelter, one has to recognize the need for proper shelter and then set the goal of getting a decent place to live in.

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i would say b. research typically uses a variety of sources