Answer:
Its the last one!! (Thomas Jefferson and John Adams had an up-and-down, long-term friendship, which Jefferson wrote about in letters to friends.) hope this helps:)
Explanation:
They never said who specifically wrote it but it reveals that in the last one.
Part 3 is included because it is a critical point in the act. Because of discrimination on multiple factors (including race, gender identity, sexuality), people are not able to, as the passage states, "compete on an equal basis". To prevent segregation, acts are made to try and eliminate any kind of way that a person can be discriminated against. This is why the authors include Part 3.
The answer would possibly be C
To show the damage that can be done by believing a truth with no evidence.