The correct answer is D. Violate the informed consent concept of volunteerism
Step-by-step explanation:
In any research, it is necessary participants agree on participating in the research, after being informed of the purposes, methodology, and details about their participation, this process is called informed consent and it is par to the ethics in research. Additionally, participation should not be forced or influenced by punishments or similar. This implies, in the case presented, the researcher is violating the informed consent concept of volunteerism as she is forcing students to participate in the research to get a grade which means participants do not accept to participate voluntarily.