Answer:
A) Antonyms
Explanation:
In the case of the sentence "Although Amelia was quite lithe, her sister was clumsy and awkward" the unknown word is "lithe" and this is mainly explained by the conjunction "Although " and "her sister was clumsy and awkward" that shows the word "lithe" is the opposite of "clumsy" and "awkward" and indeed "lithe"
Google is a web search engine where a software system that is designed to search for information on the World Wide Web, while subject directory, <span>unrelated to search engines in that, it is created and maintained by human and editors, like Wikipedia.</span>
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They wouldn’t earn as much money since education is more accessible.
I believe the correct answer is the last one - to provide a contrast to his group's nonviolent efforts.
Martin Luther King advocated protests, but those which didn't end up in violence. He wanted to fight for equal black rights, without having to resort to aggression and crime. Thus he added these sentence to distinguish his group from those such as Black Panther Party, and others.