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. Such change in the nature of their personality illustrates the emergence of variation in individual differences as a result of the which environmental constraint?

A) The frequency-adaptation based on the variation in personality that was expressed
B) Where the field-dependency of the variation in personality was expressed
C) How the covert expression of the variation in personality occurs
D) When in time the variation in personality occurs