A group of researchers wanted to investigate allegations of sexual harassment on a company's assembly line.To make their observations,the researchers took jobs working on the assembly line and pretended to be new employees.What type of research is being conducted in this example

A)  correlational research 
B)  case study 
C)  unethical research 
D)  naturalistic observation

Sexual Harassment

Unwelcome or inappropriate sexual advances, requests for sexual favors, and other verbal or physical harassment of a sexual nature.

Naturalistic Observation

A research method in which subjects are observed in their natural environment without interference from the researchers.

Assembly Line

A manufacturing process in which parts are added to a product in a sequential manner to create a finished product more efficiently.