The answer is e) who, because Nizami can be replaced with he or she which means it is who. If you could replace it with her or him it would be whom.
The option that presents the best meaning for "firsthand" in the context of the paragraph is "with their own eyes," as is further explained below. (option B)
<h3>Meaning of "firsthand"</h3>
"Firsthand" is an adjective used to refer to something we have experienced directly, ourselves, as opposed to something someone else told us about. In the paragraph, the word is used to talk about doctors encountering yellow fever cases.
Taking the context into consideration, the best option is letter B, "with their own eyes." No labs or blood samples are mentioned in the paragraph, and talking to other doctors would not be a "firsthand" experience, which eliminates the other options.
In conclusion, option B is the correct answer. "Firsthand", in this context, means "with their own eyes."
Learn more about the meaning of words here:
brainly.com/question/2000633
The answer to the question above is option C: <span>For the first time in decades, Baby Boomers have been outnumbered by another group—the Millennials. So in writing, when we say hook sentence, this is the sentence that is typically found in the introduction--usually the first and the second sentence. The purpose of a hook sentence is to catch the readers' attention in order to make the readers read more of the essay.</span>
