Compared to early hominid ancestors modern humans have jaws that are what

Hello. This question is incomplete. The full question is:

"Compared to early hominid ancestors, modern humans have jaws that are . A) larger and less rounded.  B) larger and more rounded.  C) smaller and less rounded.  D) smaller and more rounded."

C. Smaller and less rounded.

Explanation:

Hominids were great bipedal primates that are characterized as ancestors of modern humans. Despite being 97% similar to modern humans, some physical and intellectual differences can be pointed out.

Firstly, the brain of these ancestors was less developed than the brain that we present now and that is why the human being may have a greater cognitive and intellectual capacity than his ancestors. There are also some physical differences, the most striking, however, is the difference between the jaws of human beings and hominid ancestors. While hominid ancestors had more prominent, developed and larger jaws, humans have smaller and less rounded jaws.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

the tricuspid valve is present between right atrium and right ventricle