Zulus who live in South Africa consider women with body mass indexes (BMIs) of 20 (normal) and 40 (severely obese) to be equally attractive. However, after living in Britain for at least 18 months, Zulu immigrants rated women with BMIs over 25 as much less attractive. This suggests that a. body size is an indicator of relative health. b. white Britons prefer women who are extremely underweight. c. relative slimness is a universal determinant of attractiveness. d. the Zulu migrants adopted the cultural preferences of their new environment. e. large-bodied women are universally considered unattractive.