Answer:
Paragraph 1 explains the cause (mystery) of the investigation.
Paragraph 2 shows the results (the wildfires near Ontario).
Explanation:
The first paragraph states the mystery of the Dark Day in 1780 that is the cause of an investigation by researchers in Missouri.
The second paragraph comes up (shedding light) with a possible explanation that is the result of the investigation.
shop + -er
limit + -ed
fear + -ing
B. The Last of the Really Great Whangdoodles
C. Harry Potter and The Sorcerer’s Stone
D. Bridge To Terabithia