Figure 37.1 shows the results of a study to determine the effect of soil air spaces on plant growth.

Figure 37.1
-The best conclusion drawn from the data in Figure 37.1 is that the plant

A) grows best without air in the soil.
B) grows fastest in 5-10% air.
C) grows best at soil air levels above 15%.
D) does not respond differently to different levels of air in the soil.
E) would grow to 24 grams in 40% soil air.