Two economists created fake resumes with either common African-American names such as Lakisha and Jamal or common white names such as Emily and Greg. After sending them to potential employers with "Help Wanted" ads in Boston and Chicago newspapers, they found that

a. black employees earned 50 percent less than white employees in Chicago but that blacks and whites had similar wages in Boston.
b. black employees earned 50 percent less than white employees in Boston but that blacks and whites had similar wages in Chicago.
c. job applicants with white names received 50 percent more phone calls from interested employers.
d. job applicants with white names received 7 percent more phone calls from interested employers.

c