Concept:Development is a lifelong process of qualitative change. Social development depends on interactions with people and surroundings, so it is linked to environment.Explanation:Social development means learning to form relationships with others. Infants bond with caregivers, then later with peers and family. These interactions shape a child's self-concept and behaviour. The environment, such as family and community, directly influences this growth. Other options are wrong: Physical development is mainly biological, not purely environmental. Cognitive development follows maturation stages (Piaget), not just environment. Emotional development is also influenced by both maturation and environment, but the most direct match for “Social Development” is environment.Answer:Option C: Social Development - Environment is correctly matched.