A Biologist Grew 10 Groups of Flowers in 1-Square-Metre Plots

A biologist grew 10 groups of flowers in 1-square-metre plots of soil. In five plots, the biologist planted 20 flowers, and in the other five plots, the biologist planted 100 flowers. At the end of the summer, the biologist counted the seeds that each flower produced and found 100 seeds per plant in the plot with 20 plants and 500 seeds per plant in the plot with 100 plants. This is an example of

A) density-independent population regulation.
B) positive density-dependent population regulation.
C) negative density-dependent population regulation.
D) self-thinning curve.