Answer:
A. adjective/confident
Explanation:
Dr. Martin Luther King is confident in the reason for his tears.
The thing which is most closely the meaning of assured in the following passage (paragraph 39) letter from Birmingham jail is:
Based on the complete text, we can see that Martin Luther is giving an emotional speech about the things which he faced in the Birmingham Jail based on racial segregation.
This refers to the use of words that show that a person is sure of what he is saying.
Read more about adjectives here:
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