Charles Murray and Richard Herrnstein Published the Bell Curve in 1994

Charles Murray and Richard Herrnstein published The Bell Curve in 1994, which received a lot of attention for its contention that economic and social hierarchies reflect a single dimension, that of

A) physical fitness, as measured by the President's Fitness Test.
B) income and social status, as measured informally by such factors as country club membership.
C) intellectual ability, as measured by number of academic degrees.
D) cognitive ability as meansured by IQ tests.