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Question:

Who attributed the theory that says people are motivated by the need for power, achievement, and affiliation?  

A David McClelland 
Explaination

The Achievement Theory is attributed to David McClelland and says people are motivated by the need for power, achievement, and affiliation. Vroom introduced the Expectancy Theory, Herzberg introduced the Hygiene Theory, and McGregor is known for Theory X and Theory Y.