A researcher uses a sample of n 5 60 participants to test whether people have any preferences among three kinds of apples. Each person tastes all three types and then picks a favorite. What are the expected frequencies for the chi-square test for goodness of fit?

a. 1 3, 1 3, 1 3

b. 10, 10, 10

c. 20, 20, 20

d. 60, 60, 60