Francine is researching air pollution in major US cities. She wants to understand the negative effects of air pollution in those cities and has conducted some research. After beginning her draft, she has concluded that she has enough information to start, but she needs to narrow down the information that she is using in her paper to best support her topic. Which source would most likely support her research on air pollution in major US cities?

A.
a government website with data on air pollution throughout the United States
B.
a website promoting the use of electric cars over gas-powered cars
C.
a documentary on the benefits of living in cities with high air pollution levels
D.
a brochure geared for Americans on how to help reduce air pollution