Richard Potts Describes the Evolutionary History of the Human Species

Richard Potts describes the evolutionary history of the human species as "survival of the generalist" because

A) our species is narrowly adapted to a specific environment.
B) our species had the plasticity to survive the extremes of rapidly fluctuating climates of the Ice Ages.
C) our ancestors' gene-based ability to cope with small environmental fluctuations was exapted to cope with larger and larger fluctuations.
D) b and c