Answer:
The correct answer is: Research bias
Step-by-step explanation:
Experimental bias, also known as research bias, is the phenomenon in which the researcher, that is conducting the experiment or the research, influences or effects the results or outcomes of the research to give the desired or expected outcome.
A bias may arise when the researcher selects the test subjects that are more likely to generate the expected result or when the researcher influences the test subjects to give the expected result.
This is influenced by the inability of a human being to remain unbiased and neutral.
Therefore, the given example is the demonstration of a research bias.