Suppose Amy and her friend, Curtis, are orphans. They both are curious about their ancestry and decide to sequence their mitochondrial DNA and create a phylogenetic tree with other classmates. The results show that Curtis and Amy share a relatively recent common ancestor. What can you conclude about the ancestral relationship between Amy and Curtis?

Select one:
a. Curtis and Amy are distant cousins.
b. Curtis and Amy share a common paternal ancestor.
c. Curtis and Amy do not share a common ancestor.
d. Curtis and Amy share a common paternal and maternal ancestor.
e. Curtis and Amy share a common maternal ancestor.