According to Vygotsky, which of these is a key factor in a child's cognitive development?

A) balanced diet
B) social interactions
C) genetic endowment
D) successful resolution of psychosocial crises

Vygotsky believed that social interactions and cultural tools played a crucial role in a child's cognitive development, through the process of socialization and internalization of language, beliefs, and values. While genetic endowment may influence some aspects of cognitive functioning, it is not a sufficient explanation for the complexity and variability of human cognition. A balanced diet and successful resolution of psychosocial crises may contribute to overall well-being, but they are not specifically related to cognitive development.