In which scenario is the ecosystem the most stable? Suggest a reason for this and use the word competition in this explanation

The ecosystem was most stable where the rabbit eats only plant A. I feel like this happened because since the rabbit is only eating plant a, the competition between plants A and B is reduced

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

correct answer is a. and d.