Boundary work is work done to maintain the border between legitimate and nonlegitimate science within a specific discipline or l

I believe the correct choice is D.
Hope I Helped: )

United States won the war.

There may be various interpretations of this joke, with one being that he told the curtains to get themselves together. This humorous response plays on the dual meaning of the verb "pull," which can imply both calming down and literally gathering something.