Sharon reads two different articles about avocados. The first article, in a weight-loss magazine, claims that avocados are unhealthy because they are high in fat. The second article, in an annual publication from a doctors' group, claims that the fat in avocados is a type that is good for the heart. To assess these claims, which question might Sharon ask? Which source do avocados come from? Where are avocados sold? Is the source an authority on the subject? How much do avocados cost?