Based on what you've learned here about the Barnum effect and common biases found in research, which of the following is likely a limitation of studies or demos like this that involve surveys and self-reporting? a. People don't always tell the truth or tend to exaggerate or downplay aspects of their lives.
b. People often tell researchers what they think these authority figures want to hear, based on their assumptions about the study in which they're participating
c. Subjects are not randomly chosen and assigned to groups (as in more formal and rigorous Setups), but instead choose to participate in the activity, which is called self-selection bias
d. All of the choices given are legitimate concerns involving studies or demonstrations that rely heavily on surveys for their data and results.