Answer: D. All of the choices given are legitimate concerns involving studies or demonstrations that rely heavily on surveys for their data and results.
Step-by-step explanation:
Barnum Effect, is also known as the Forer Effect, and it occurs when people believe that the information given in a personality description is applicable to them even though such description is applicable to everyone. This occurs as a result of the tendency of the brain to attach to attach personal meaning for general statements.
Some biases in research include the fact that people don't always tell the truth, also they tend to tell researchers what they believe that they want to hear and subjects are not randomly chosen and assigned to groups.
Therefore, the correct option is D as all the options given is correct.