Earthworm Data Plot Number of Earthworms
A 1,145
B 978
C 125
D 1,008
E 959

Juan and Melissa were counting earthworms for a science experiment. They had predicted that they would find more earthworms in plots that shady and lots of damp soil. They marked out 3 meters by 3 meters plots. The shadiest plots were A and D.

What is another possible explanation of the student's data?
A) The plots were not all the same size.
B) The plots were shady but did not have damp soil.
C) Juan and Melissa did not count the worms accurately.
D) The earthworms moved when the students started counting.