Some primate researchers have hypothesized that the proportion of empathetically-inclined chimpanzees that yawns contagiously exceed the proportion of non-empathetically-inclined chimpanzees who do.

A.exceed the proportion of non-empathetically-inclined chimpanzees who do
B.exceed that of non-empathetically-inclined chimpanzees
C.exceeds those who are non-empathetically-inclined
D.exceeds the proportion of non-empathetically-inclined chimpanzees that does that
E.exceeds the proportion of non-empathetically-inclined chimpanzees that does so

OA is E

Can an Expert buttress the validity of Option E. This is because Option D looks correct too.