According to your textbook, a key factor in why growing up in a low-income family is associated with lower IQs is likely

A) stress.
B) genetics.
C) a lack of interest in learning.
D) season of birth.

Answer: A
Rationale: Low-income households face higher stress levels on a day-to-day basis, and this stress can distract children from school; in addition, the stress responses can negatively impact brain development.