An Examination of the Artifacts of an Ancient Population in the Central

An examination of the artifacts of an ancient population in the central region of a southern continent indicates that as climate change over many hundreds of years became much colder, these individuals became more adventurous, bold, and aggressive. On the opposite side of the world, as the climate change over many hundreds of years became much warmer, the individuals became more cooperative and passive. Such change in the nature of their personality illustrates the emergence of variation in individual differences as a result of which environmental constraint?

A) Where the variation in personality occurred
B) How the fixed-action pattern of the variation in personality was expressed
C) How the biosocial-frequency sequence became dominant
D) When in time the field-dependency of the variation in personality was eliminated