Comparative Research on Area MT Indicates That the Precursor to This

Comparative research on area MT indicates that the precursor to this area probably evolved

A) before the emergence of primates,given that humans,apes,monkeys,and tree shrews all have homologous areas.
B) early in primate evolution,given that humans,apes,and monkeys,but not tree shrews,all have homologous areas.
C) late in primate evolution,given that only humans,gorillas,and chimpanzees have homologous areas.
D) late in primate evolution,given that no other species has a homologue to human region MT.