A Young Student Is Trying to Figure Out the Order $\rightarrow$

A young student is trying to figure out the order in which certain traits evolved in humans. Which of the arrangements below is MOST likely correct?

A) bipedalism $\rightarrow$ more dextrous thumbs $\rightarrow$ human jaw $\rightarrow$ language
B) more dextrous thumbs $\rightarrow$ bipedalism $\rightarrow$ human jaw $\rightarrow$ language
C) language $\rightarrow$ human jaw $\rightarrow$ bipedalism $\rightarrow$ more dextrous thumbs
D) bipedalism $\rightarrow$ human jaw $\rightarrow$ language $\rightarrow$ more dextrous thumbs
E) more dextrous thumbs $\rightarrow$ language $\rightarrow$ human jaw $\rightarrow$ bipedalism