In His Study of New York Department Store Employees, Labov

In his study of New York department store employees, Labov found that

A) /r/ was pronounced most frequently by workers in the upper-middle-class store (Saks) .
B) /r/ was pronounced most frequently by workers in the middle-class store (Macy's) .
C) /r/ was pronounced most frequently by workers in the lower-middle-class store (S.Klein's) .
D) workers in all three stores pronounced /r/ with the same frequency.
E) none of the workers with whom he interacted pronounced /r/.