Which of the following is one of the process Theories of motivation ?

Alderfer's ERG Theory, McClelland's Achievement Motivation Theory, and Murray's Manifest Need Theory are all Content (Need) theories of motivation, which focus on 'what' internal needs energize human behaviour. Process theories include Vroom's Expectancy Theory, Adams's Equity Theory, and Locke's Goal-Setting Theory; hence, none of the given options is a process theory.