The right option is; C
Which species of mushroom is this? is the question that a dichotomous key can help her answer.
A dichotomous key is a tool designed by scientists to enable its users to determine the identity of species and objects. A dichotomous key contains several questions with two choices in each step that guide the user to the correct name of a specie. It helps to identify species based on their characteristics and it identifies species by their unique scientific name.