Deandre is recording instances of physical aggression among children in a schoolyard at recess. he is undertaking:

Naturalistic observation

Explanation:

If Deandre is conducting this type of research, he is engaging in naturalistic observation. Naturalistic observation is a research method that is commonly used in the social sciences, particularly psychology. The technique involves the observation of subjects in their natural environment. In this case, Deandre is observing children during recess, as the schoolyard can be considered the natural environment of children in modern times.

it's the under parts of the car

answer; the negotiator was not in full control of his or her actions and hence should not be held responsible;