Answer
a)
Nutrition club--could lead to biased results
Boys' wresting team--not likely to lead to biased results
Homeroom sample--not likely to lead to biased results
Work Step by Step
a) The nutrition club could likely be biased toward their preferred lunch. The wresting team and the homeroom sample would tend to have a wider palate of options.
b) Do you prefer flavorful pizza or boring hot dogs for lunch? (biased toward pizza)
What is your preferred lunch? (no bias)
