Because it helps understand perspective
If the octopus is inside one of the boxes, it doesn't matter what you ask if trying to find out which box the octopus is BEHIND
<span>The question is asking us to answer Which sentence uses commas correctly?. We see here that Savannah is the name of the city and that the city is already mentioned - the name is an extra information. You could for example say "The southern city is a beautiful place". This means that the information about the city name is added, and an added, unnecessary information is surrounded by comas on both sides - so the correct answer is
c. The southern city, Savannah, is a beautiful place.</span>
Two devices would be imagery and sound