Answer:
D. A forensic sociologist
Explanation:
When it comes to terms about determining human behavior, a person who should be contacted to help is a sociologist; as they study and examine human behavior and interaction.
Answers A. and C. are easy to cross out due to the fact that they relate to the study of everything but a human being, such as animals and insects.
However B. is tricky, some may argue that it would be correct because pyshciatrists study the mental health of humans and that mental health decides human behavior.
In defense, though this is correct, psychiatrists study in cases that involve more of suicidal tendencies or drug use, its therapy to help out of a situation, when a sociologist on the otherhand study the human's mind.