Question5. A recent survey by a Canadian magazine on the contribution of universities to the economy was circulated to 394 people who the magazine decided "are the most likely to know how important universities are to the Canadian economy." Which of the following is the main problem with using these results to draw conclusions about the general public's perception? (a) Insufficient attention to the placebo effect. (b) $X 0$ control group. (c) Lack of random assignment. (d) Lack of random selection. (e) Response bias.