Direct quotations should constitute no more than
percent of the total words of the research paper.
a)two
b)four
c)eight
d)ten

10 percent

Explanation:

A direct quotation is a report of the exact same words of an author and is placed inside quotation marks (") in a written work. They differ from the indirect quotation because in those you paraphrase, write with your own words, what the author said.

  If your quotations constitute more than ten percent of the research paper you would make your own paper hard to read because you´ll move from one quotation to another. The quotation must be used only to support your own ideas or refute the other author´s ones.

yeah! it's really me with my homework, you should try it!

i think its d, but grammarly says none

explanation: