Personality is fruitfully studied at multiple levels of analysis because people are best understood as

A) unconscious information processors.
B) biopsychosocial organisms.
C) demonstrating self-serving bias.
D) possible selves.

Personality is influenced by biological, psychological, and social factors, making individuals biopsychosocial organisms. Therefore, studying personality at multiple levels of analysis allows for a more comprehensive understanding of individuals. Option A is incorrect because unconscious information processing is only one aspect of personality, and it does not encompass all levels of analysis. Option C is incorrect because self-serving bias is a cognitive bias, not a level of analysis. Option D is incorrect because possible selves are future-oriented representations of oneself, not a level of analysis.