Place the Following Evolutionary Milestones in Order from First to Most

Place the following evolutionary milestones in order from first to most recent.

A) ability to walk upright→tool use→use of fire→big brain
B) ability to walk upright→use of fire→tool use→big brain
C) ability to walk upright→big brain→tool use→use of fire
D) big brain→ability to walk upright→tool use→use of fire
E) big brain→tool use→ability to walk upright→use of fire