As a result of Karl Lashley’s work in the field of anatomy, neuroscientists now believe that the learned information encoded in
86 billion of the neurons found in a human brain are primarily stored in merely four small parts of the brain, the prefrontal cortex, hippocampus, amygdala, and cerebellum.
"the learned information" is singular subject => are is incorrect => A,B,C out
D and E
(D) the learned information encoded in
the 86 billion neurons found in the human brain is primarily stored in a mere four small parts of the brain
(E) the learned information encoded in
86 billion of the human brain’s neurons is primarily stored in merely four small parts of the brain
E is better, more clear and precise than D.
"in
a mere four small parts of the brain" vs. "in
merely] four small parts of the brain"
merely is correctly used to reflect the intended meaning, i.e only/ solely
a mere: "a" is incorrect since "four parts" is plural. also "mere" (means small/ not large) distorts the meaning.
"the 86 billion neurons found in the human brain" vs. "86 billion of the human brain’s neurons "
I think "the" here is not completely accurate. we dont need to define this 86 billion neurons different from other "86 billion neurons".
"neurons found in the human brain" or "the human brain’s neurons" both are ok
Answer: E