According to the Molecular Clock Data in Figure 26

According to the molecular clock data in Figure 26.14 (below) , approximately what proportion of differences (per amino acid site) has accumulated between the common ancestor of all vertebrates (including fish) and the common ancestor of humans and kangaroos?

A) 0.1
B) 0.3
C) 0.5
D) 0.7
E) 0.9