The concluding sentence of this article
a) introduces a new question.
b) summarizes the entire article.
c) explains the meaning of a new word.
d) prepares readers for another paragraph.

The concluding sentence of this article  summarizes the entire article.

Option B

Explanation:

An article is prepared with mainly four paragraph, of which the first paragraph introduces the topic of the article with brief acknowledgement of the subject of the topic of the article.

Second paragraph deals with the objective of the topic of the article and thereby it may take one or two or more paragraph, describing about the same.

Third paragraph is the subjective part of the article where the author describes the discussion part of the article and let the reader know by the time about the topic well and its diversity as well.

Fourth paragraph is the conclusion of the topic of the article where all the discussion is concluded with the objective well described. And so the concluding sentence summarizes the entire article.

i think the answer is c

the answer is slaves

douglas was a slave who turned into a statesman and he refused to celebrate the 4th of july until all slaves were emancipated or set free.