In which of the following ways was Experiment 2 different from Experiment 1?

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.

A. Experiment 2 included trees from more than 1 population.
B. Experiment 2 combined trees from more than 1 species.
C. Experiment 2 trees were planted at all 5 sites.
D. Experiment 2 trees were planted at only 1 site.

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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 0.8 1.3 6.1 A2 5.7 3.2 9.6 4.2 4.9 A3 3.2 1.7 8.4 3.2 6.1 A5 3.5 5.2 7.0 0.2 3.9