Baby paolo smiles and coos so often and is so delightful that his parents feel compelled to smile and chatter right back at him. which sort of genetic environmental does this best illustrate?

The genetic environment illustrated by the smiling parents prompted by the smiles and coos of their baby is the evocative gene environment.

This evocative gene environment refers to the environment when the genetic attributes of a child affects the behavior of others towards him. In the given scenario, the constant smiling and cooing of the child are prompting his parents to interact with him constantly.

Hence, the correct answer is 'evocative gene-environment'.