All of the guests HAD gone to the concert in the park.
(But I think it could also be have, if you are talking about it happening in the present).
Answer:
By adding to mood and depth perception of the text
Explanation:
Descriptions of the setting contribute to the central ideas of the article by establishing (a) mood(s) that go(es) along with the events described which lead to them. According to the author(s), "The survivors lacked equipment such as cold-weather clothing and footwear suitable for the area. They lacked any kind of medical supplies, and the only doctor on the flight, Dr. Francisco Nicola, died in the crash." (Staff 4).
^Hope this helps.
I think the answer is A) : because is a form of punctuation to use before you list things.
