D. parallel structure just means that all of your verbs in the comma series line up in regards to tenses, here. in choice D, it's "BE friendly," "INTRODUCE yourself," and "SMILE." these are all present tense verbs.
the rest of the choices don't match--"exercise" and "stretching" are two different verb forms in choice A, "to go to the library" is the odd one out in choice B, ane "to build" doesn't match with the "-ing" verbs in choice C.
C.
Creating a timeline of events by ordering them with respect to time is equivalent to arranging them chronologically.
I believe that the answer to the question provided above is the Harlem culture lead to civil rights movement since Harlem renaissance is the rise of the negros which are the most affected by racism.
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The correct answer is A: Novel. The Novel was published in 1766, and during the 19th century, it was one of the most popular and widely known/spread Novels in Britain.