Which of the following was not identified as a McDonald's product quality issue under Easterbrook?

a- complaints about the Egg McMuffin now being available all day

b- Consumer Reports ranking of the Big Mac as the worst hamburger

c- the use of antibiotics in the U.S. supply of chickens

d- negative reputation of the use of "Pink Slime" in meat products

e- a low ranking in American Customer Satisfaction Survey