The answer is not A

Twenty onion seeds were randomly assigned in pairs to two different types of soil: Soil A and Soil B. The first pair of seeds were planted nearest to a window and received plenty of sunlight. The next two seeds were planted in each type of soil and were placed 6 inches away from the window. The third pair of seeds were planted in each type of soil and were placed 1 foot away from the window, and so on. After 6 months the onions were harvested and their diameters were measured (in centimeters). The dotplot below shows the mean difference (Soil A - Soil B) in diameter for each pair of onion seeds. -2 -1.5 -1 0.5 0 0.5 1 1.5 2 Difference (Soil A - Soil B) in diameter (cm) Which of the following accurately describes what the dotplot reveals about whether Soil A tends to produce larger onions than soil B. Select one: a. It does not appear that Soil A tends to produce larger onions than Soil B because the distribution of differences is skewed fairly symmetric. x b. It does not appear that Soil A tends to produce larger onions than Soil B because 5 of the differences are positive. O c. It does not appear that Soil A tends to produce larger onions than Soil B because only 5 of the differences are positive. d. It does not appear that Soil A tends to produce larger onions than Soil B because 1 of the differences are zero. O e. It does not appear that Soil A tends to produce larger onions than Soil B because the sample size is too small