An ecologist samples trees in multiple forest plots to determine species richness. Which ONE of the following can help determine the adequacy of sampling effort?

Options

A. Graph the number of new tree species in each successive sampling plot.
B. Graph the total number of tree species per total area for all plots combined
C. Graph the number of individuals per tree species in each successive sampling plot.
D. 30 sampling plots are sufficient, irrespective of the forest area.