Which Data Would Be Suitable for a Pie Chart

Multiple Choice

Which data would be suitable for a pie chart?

A) Average starting salary of MBA graduates from six ivy-league universities
B) APR interest rates charged by the top five U.S. credit cards
C) Last semester's average GPA for students in seven majors in a business school
D) The number of U.S. primary care clinics by type (urban, suburban, rural)