Answer:
B. volunteer bias.
Explanation:
-Experimenter bias is when the expectations of the experimenter in regards to the outcome are communicated to the participants in any form.
-Volunteer bias refers to a situation in which the people that volunteer to take place in a study doesn't represent the general public.
-Research bias is when the experimenter influence the result to get a specific outcome.
-Social desirability bias is when the people taking part in a study give their responses in a way that is viewed as favorable.
According to this, the answer is that the situation would be an example of volunteer bias.