Answer:
B. Research shows that some junk food ads target kids.
Step-by-step explanation:
Option B is the sentence that contains evidence for the main idea of the passage.
From the passage, we are given evidences of the research that actually shows that some junk food ads target kids. The Public Library of Science showed that ads aimed at kids actually focused on toys that come with junk food than on the food itself. The use of TV shows and movies connected to children is another way that fast--food restaurant are targeting kids with their ads.