**Core Concept**
The cognitive theory of child development focuses on the growth and development of a child's mental processes, including perception, attention, memory, language, problem-solving, and thinking. This theory emphasizes the role of active learning, experience, and environment in shaping a child's cognitive abilities.

**Why the Correct Answer is Right**
Jean Piaget's cognitive theory is a prominent example of this approach, which suggests that children actively construct their own knowledge and understanding through interactions with their environment. According to Piaget, children progress through four stages of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational. Each stage is characterized by a unique way of thinking and problem-solving, with the child gradually increasing in cognitive complexity and abstraction.

**Why Each Wrong Option is Incorrect**
**Option A:** Lev Vygotsky's sociocultural theory, while related to cognitive development, focuses more on the role of social interaction and culture in shaping a child's cognitive abilities. It does not emphasize the active construction of knowledge through individual experience.
**Option B:** Erik Erikson's psychosocial theory focuses on the role of social and emotional development in shaping a child's identity and personality. It is not directly related to cognitive development.
**Option C:** Urie Bronfenbrenner's ecological systems theory provides a framework for understanding the various environmental factors that influence child development, but it does not specifically address cognitive development.

**Clinical Pearl / High-Yield Fact**
Piaget's theory highlights the importance of active learning and hands-on experience in promoting cognitive development. This has implications for educational practices, suggesting that children should be encouraged to explore and learn through direct experience rather than simply being told information.

**Correct Answer: C. Erikson