Solipsism is the belief that only oneself and one’s own experiences are real, while anything else—a physical object or another person—is nothing more than an object of one’s consciousness. Thus, in a sense, solipsism is the concept that nothing “exists” outside of one’s own mind. As a philosophical position, solipsism is usually the unintended consequence of an overemphasis on the reliability of internal mental states, which provide no evidence for the existence of external referents.

In this passage, the author is primarily concerned with

A discussing the importance of a phenomenon.
B refuting a hypothesis advanced by philosophers.
C contrasting two schools of thought.
D presenting the definition of a concept.
E comparing a physical object to a person.