Three students test the effect of fertilizer on bean plant growth. Each student conducts one trial. They plant 10 bean seeds in each of three pots of soil with different amounts of fertilizer. After two weeks, they measure the heights of the plants in each pot. Then they find the average height for each amount of fertilizer. The table summarizes the results of the experiment. Effect of fertilizer

Trial 1 trial2 trial 3
none 12.1 21.5 13.7
a little 14.4 15.2 16.3
a lot 22.5 13.7 19.9

Which statement shows the pattern in the data?

A. The data from trial 3 are inconsistent with the data from trials 1 and 2.
B. The data for the average heights of the plants in trials 1 and 3 contain errors.
C. The trend in the data for trial 2 shows that plants grow taller if given more fertilizer.
D. The data from trial 2 are inconsistent with the data from trials 1 and 3.