Explanation:

- Option 1: Samuel A. Stouffer

- Samuel A. Stouffer was an American sociologist known for his work on the American Soldier studies during World War II. He did contribute to the understanding of relative deprivation in group settings.

- Answer: Concept of 'Relative Deprivation' is often associated with Stouffer.

- Option 2: R.K. Merton

- Robert K. Merton was a significant figure in sociology known for concepts like "self-fulfilling prophecy" and "role model."

- He did not originally coin the term 'Relative Deprivation.'

- Option 3: W.G. Summer

- William Graham Sumner was a notable social scientist known for his work on social norms and coined the term "ethnocentrism."

- He did not originate the concept of 'Relative Deprivation.'

- Option 4: A. Henderson

- A. Henderson is not known for contributions to the concept of 'Relative Deprivation.’