What plays an important role in a child's daily health and wellbeing?

All of the options presented—parental supervision, regular exercise, and a balanced diet—are vital components of a child's daily health and wellbeing, which is why the correct choice is the one that encompasses all these aspects.

Parental supervision is crucial as it ensures that children engage in safe practices and develop healthy habits. Active involvement in a child's life provides guidance in their nutrition, physical activity, and social interactions, fostering their emotional and physical health.

Regular exercise contributes significantly to a child’s overall physical fitness, aiding in muscle and bone development, maintaining a healthy weight, and improving mental health. It encourages children to develop positive attitudes towards physical activity, which can carry into adulthood.

A balanced diet supplies the necessary nutrients essential for growth, development, and overall health. It plays a fundamental role in cognitive function, physical health, and the ability to perform daily activities.

Considering that all these elements interconnect to support a child's health, the comprehensive nature of the correct answer reflects the multifaceted approach needed for promoting children's wellbeing. Each aspect complements the others, ensuring that a child’s needs are met in a holistic manner.