Distinguish between selection and participation bias.

Which example demonstrates participation bias?

a.) A clothing store collects surveys from every customer whose order totals more than $100.

b.) A study that only tested one type of insect concludes that a certain pesticide is more effective for defending tomato plants against all pests.

c.) A doctor's office conducts a quality review of their medical charts by randomly reviewing every third chart.

d.) A study concludes that adults generally prefer whole milk over skim milk, based on voluntarily submitted data.