Final answer:
Harper’s case demonstrates the impact of nurturing on development, showing that a supportive environment can contribute positively to a child's growth and milestones, indicating the answer would be D. Nurture.
Step-by-step explanation:
The scenario involving Harper, a two-year-old girl who has thrived in a responsive and caring foster care home and met her developmental milestones, exemplifies the influence of nurture in human development.
Despite the early challenges, including premature birth and exposure to cocaine, and the subsequent developmental delay, a nurturing environment provided by the foster care and state early intervention program significantly contributed to Harper's positive growth and development.
This shows that while nature (biological and genetic factors) is pivotal, nurture (environmental factors and caregiving) can play a transformative role in the development of children, potentially mitigating the negative effects of early biological risks.