Emily wrote this paragraph in an article for her school newspaper: Massive fires that occur during periods of drought are leading to deforestation in the Amazon. One study supports the idea that fires are a problem: “Over the course of the experiment, repeated fires during a drought killed 60 percent of trees,” says geographer Jennifer Balk. Other researchers have confirmed that the Amazon’s damaged forests are especially vulnerable to wildfire.

Which of the following statements about Emily’s work is true?

A.
This paragraph quotes a geographer, signaling that Emily used primary sources.
B.
This paragraph lacks focus, suggesting that Emily did not narrow down her research topic.
C.
This paragraph expresses clear relationships between facts, so Emily integrated her research findings.
D.
This paragraph relies on only one source, indicating that Emily did not pursue multiple avenues of exploration at all.