All would seem appropriate, but I'd say D, since it assists you in gathering data to support your clause
Part A) Egyptians built the pyramids.
Part B) The other cites three specific details
<em>How it works. </em><em>A camera obscura is a dark room with a small hole in one wall in its simplest form.</em><em> When it's bright outside, light enters through the hole and projects an upside-down image of the outside world onto the wall opposite the hole.</em>
I think the answer they are looking for there is "Military".
Answer:
A dependent clause is a group of words that has both a subject and a verb and cannot stand alone as a sentence.
Explanation: