What have studies on the evolution of the hominin brain revealed?

A) Expansion of the arcuate fasciculus may have created links in the brain that make language possible.
B) Enlargement of the putamen and cerebellum may have increased the precision of the larynx.
C) Full-blown language may be unique to modern humans.
D) a and b
E) a, b, and c

Arcuate Fasciculus

A bundle of nerve fibers that connects the Wernicke's area and Broca's area in the brain, facilitating speech and language processing.

Putamen

A round structure located at the base of the forebrain, part of the basal ganglia, involved in a variety of complex movements and implicated in various neurological disorders.

Cerebellum

A part of the brain located at the back of the skull, primarily responsible for coordinating voluntary movements, balance, and posture.