Scientists conducted an investigation to study the possible effects of air pollution on chlorophyll a and chlorophyll b in plants. The scientists gathered plants from polluted areas and unpolluted areas and then measured the presence of chlorophyll in 50 mg of plant leaves. The results are shown in the graph. Which inference do these data support? Concentration of Chlorophyll 1.8 1.6 1.2 KEY Concentration of Pigment per Leaf (mg/g) 1.0 0.8 Chlorophyll a Chlorophyll 0.6 0.4 0.2 0 Polluted Unpolluted area area Location Source: Giri et al., "Effect of Air Pollution on Chlorophyll Content of Leaves," Current Agriculture Research Journal, 2013 A. Gene expression for chlorophyll is not affected by pollution.

B. Cellular respiration increases in plants in polluted areas.

C. Photosynthesis decreases in response to air pollution.

D. Plants in polluted areas can adapt in order to survive.​