Kinsey reported data concerning the percentage of people who engaged in various sex acts. Why should we be skeptical of the percentages he reported?

A) Kinsey based his percentages on results from fewer than 1,000 people.
B) Kinsey had little skill as an interviewer and most people said he made them nervous.
C) Kinsey did not use a random or representative sample of the population.
D) Kinsey reported surprisingly little variation from one person to another.

Kinsey's sample was not random or representative, so the percentages he reported may not accurately reflect the general population. Also, the sample size (less than 1,000 people) may not have been large enough to draw accurate conclusions. Additionally, Kinsey's methods of recruitment and interviewing have been criticized for bias and potential errors. Therefore, the percentages reported by Kinsey should be viewed with skepticism. Option A and D could be partially correct as well, but C is a more comprehensive answer.