Native Plant a Is Endangered

Native plant A is endangered.You suspect that part of the reason for its decline is competition with an introduced exotic plant,B,that occupies a similar ecological niche.Which of the following experiments would help you decide whether competition with B contributes to the decline of A?

A) Raise each species by itself in the absence of competition in a greenhouse, and measure growth and reproductive rates.
B) Establish experimental plots in which you remove plant B.
C) Count the number of seeds produced by A and B in nature.
D) Quantify damage by herbivores on A and B in nature.
E) All of the above