A city council is reviewing two proposals for programs designed to enhance long-term cognitive development in children. Proposal A advocates for creating highly stimulating, interactive environments for infants and toddlers (ages 0-3), focusing on rich sensory experiences and social engagement. Proposal B argues for implementing intensive, structured academic tutoring for children aged 5-7, once they have basic language skills. Based on your understanding of the period of extensive neural growth that occurs in the first few years of life, which proposal offers a more critical and foundational investment for a child's future learning capacity? Justify your decision.