Correct Answer:
B. That early family stress was strongly associated with earlier sexual maturation in females
The featured study supported Belsky's evolutionary hypothesis, finding that early family stress was strongly associated with earlier sexual maturation in females. Girls who experienced higher levels of family conflict, instability, or stress during childhood tended to reach puberty earlier than those raised in more stable family environments.
- Early family stress → Earlier sexual maturation in females.
- Supports: Belsky's evolutionary theory.
- Key idea: Early psychosocial environment can influence the timing of puberty.
Therefore, the correct answer is: "That early family stress was strongly associated with earlier sexual maturation in females."