A scientist is writing a journal article that explains how logging practices in the rain forests of South America is having a negative effect on air quality around the globe, particularly because of trees ability to convert carbon dioxide into oxygen during photosynthesis: the process plants use to give themselves energy.

Which of the graphics described below would best support this test?

(a) A map displaying ports in South America that ship illegal rain forest wood.
(b) A diagram explaining how rain forests have a major effect on air quality.
(c) A photo showing how healthy rain forests attract tourists and help the economy.
(d) A line graph showing how air quality decreases as are factories are built in cities.