Based on the results of Experiment 1, which soil/ compost mixture yielded the greatest average plant height after the first 2 weeks?
A. 4
B. 3
C. 2
D. 1

Experiment 1
The students dug a soil sample from an empty field next to the school. They put soil into 4 different clay pots, and mixed in various amounts of compost so that the volume of soil mixture was the same in each pot. They then planted the same number of radish seeds (4) in each pot. The soil/compost mixtures for each pot are shown in Table 1.

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Soil/compost mixture (Pot #) 1 2 3 4 Table 1 % Soil/% compost 25%/75% 50%/50% 75%/25% 100% soil