Step 1: Understanding determinants of personality.
Personality is influenced by various factors, such as heredity, culture, family background, and experiences. Physical traits like eye color and body shape are determined by genetics, i.e., heredity.
Step 2: Analyzing the options.
(A) Culture: Incorrect. Culture influences behavior and social norms but does not directly determine physical traits like eye color or body shape.
(B) Family Background: Incorrect. Family background influences values and upbringing but does not determine physical traits.
(C) Experience: Incorrect. Experience influences personality development, but physical traits like eye color and body shape are not a result of experiences.
(D) Heredity: Correct. Heredity is the genetic factor that determines physical characteristics like eye color, body shape, and facial features.
Step 3: Conclusion.
Therefore, the correct answer is (D) Heredity, as it determines physical traits such as eye color, body shape, and facial features.
Final Answer: Heredity.