While ontology is interested in the questions related to the apple’s existence, epistemology is interested in how we gain our knowledge of an apple. For example, how is it that we know that there is a thing called apple, and it is edible, and it has a taste, the taste can be sweet or sour, it has a particular material structure, it is juicy, it is smelly, and our knowledge that apple has health benefits, and what those benefits are and so on. The correct answer is A.