Main instinct picked up by Freud to account all human behaviour in his psychoanalytical theory of motivation is?

Main instinct picked up by Freud to account all human behaviour in his psychoanalytical theory of motivation is?
(a) Life instinct
(b) Death instinct
(c) Sex instinct
(d) Both a & b
✅ Answer: (c) Sex instinct
Explanation: Freud emphasized the sex instinct (libido) as the primary driving force behind human behavior.