Differential sensitivity means that certain people have genes that:

A) make them more vulnerable to particular experiences.
B) interact and coordinate to influence developmental outcomes.
C) determine their social interactions and intellectual outcomes.
D) have an unknown impact on their long-term development.

Differential sensitivity refers to the fact that certain people have genes that make them more vulnerable to particular experiences. This means that people with these genes may be more impacted by certain environmental factors, both positive and negative. It is not about genes that interact and coordinate, determine social interactions and intellectual outcomes, or have unknown impacts on development.