a. Homeostasis
b. Drives
c. Hedonism
d. Instincts
Sigmund Freud's psycho-analytic theory of motivation centers on innate biological factors and unconscious processes. Based on the provided options, the concepts explained by Freud include:
The option 'Drives' (b) is excluded based on the correct answer choice, which focuses on Homeostasis (a), Hedonism (c), and Instincts (d).
Therefore, the concepts from the list explained by Freud in his psycho-analytic theory of motivation are Homeostasis, Hedonism, and Instincts.
| List-I | List-II |
| A. Test of Intelligence | I. Robert Woodworth |
| B. Personal Data Sheet | II. Henry Murray |
| C. Thematic Apperception Test | III. Krumboltz |
| D. Career Beliefs Inventory | IV. Alfred Binet |