I am going to say a but I don’t know
The generalization that all organisms are composed of cells was established through multiple observations in various kinds of animals and plants. A controlled experiment of finding cells in all the kinds of living organisms is not possible or is infeasible as it will require prior knowledge of all the kinds of organisms inhabiting Earth and the effort to catch and bring them in the controlled environment of the lab for testing.
A. The Flesh
The answer would be A because the mantle is right under the core, so in an apple that would be considered the flesh.
