"<span>Each guitar must be in its own case" is the sentence among the choices given in the question that is correct. The correct option among all the options that are given in the question is the third option or option "C". I hope that this is the answer that has come to your great help.</span>
the river eroding the canyon, revealing layers of history that represent billions of earth years. ... Peering into the Canyon from the rim is like living life on the surface.
The rest are things that you need to write down as you do your research: document the source title, the author, the web address, and also any important points that you might find.