Answer:
C. uses a respectful tone to show slavery's effect on slaves and slave owners
Explanation:
The answer is <u>1, 4, 5, 3, 2</u>.
They're viewed as 2nd(second) class.
The correct sentence is:
Individuals who study the brain understand more about how we learn and think.
"who study the brain" is a relative clause which begins with the relative pronoun "who". It refers to the subject of the sentence "individulas".