Final answer:
Type of contact is the first concept infants develop to understand if objects can support each other.
Step-by-step explanation:
The first concept to develop as infants learn about objects being able or not being able to support each other is Type of contact(A).
During the sensorimotor stage of development, children explore and interact with objects to understand their properties and behaviors. This includes understanding how objects can support or not support each other. For example, infants might experiment with stacking blocks and see if they remain upright or fall.
Understanding the type of contact between objects is an essential part of a child's cognitive development and lays the foundation for their understanding of physical properties and interactions in the world.