All but One of These Reasons Indicate Why Humans Have

All but one of these reasons indicate why humans have successfully colonized almost every major habitat on Earth. Choose the EXCEPTION.

A) Large amount of connections between cells in the brain.
B) Low ratio of brain volume to body mass.
C) Humans' abilities to learn and change behavior.
D) As the environment became less predictable, increase in brain size enabled humans to plan and change behavior rather than relying only on instinct.