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 $\rightarrow$ tool use $\rightarrow$ use of fire $\rightarrow$ big brain
B) ability to walk upright $\rightarrow$ use of fire $\rightarrow$ tool use $\rightarrow$ big brain
C) ability to walk upright $\rightarrow$ big brain $\rightarrow$ tool use $\rightarrow$ use of fire
D) big brain $\rightarrow$ ability to walk upright $\rightarrow$ tool use $\rightarrow$ use of fire
E) big brain $\rightarrow$ tool use $\rightarrow$ ability to walk upright $\rightarrow$ use of fire