Final answer:
In Bronfenbrenner's model of development, the microsystem has the most immediate influence on a child's development.
Step-by-step explanation:
In Bronfenbrenner's multidimensional model of development, the aspect of the environment that has the most immediate influence on a child's development is the microsystem.
The microsystem refers to the immediate environment in which a child lives and directly interacts with. This includes their family, school, neighborhood, and peers. These close relationships and experiences have a significant impact on a child's development.
For example, a child's relationship with their parents and siblings, the quality of their education, and the support and guidance they receive from their community all have a direct influence on their development.