The procedures utilized in Experiment 2 were repeated, except that only 25 containers were planted at a sixth site (S6). The results appear in Table 3. 

Experiment 2
P. palustris Miller seeds were collected and grown in the same manner as in Experiment 1. When the seeds had grown into seedlings, 150 containers were prepared with 5 A1 seedlings and 5 seedlings from either A2, A3, A4 or A5. Seven containers for each of the 4 combinations were planted at each site. Table 2 shows how many pinecones were produced on each A1 plant.

Based on these data, one should conclude that A1 trees produced more pinecones at S6 than at which of the following sites in Experiment 2?
A. S1
B. S3
C. S4
D. S5

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Site S1 S2 S3 S4 S5 Table 2 Pinecones produced per A1 tree when planted with A4 6.7 4.3 A2 5.7 3.2 9.6 4.2 4.9 A3 3.2 1.7 8.4 3.2 6.1 0.8 1.3 6.1 A5 3.5 5.2 7.0 0.2 3.9