Which Aspect(s)of Cartesian Dualism, from Among the Following, Make(s) the Problem

Multiple Choice

Which aspect(s) of Cartesian dualism, from among the following, make(s) the problem of other minds exceedingly difficult to solve?

A) Since minds are not physical substances, they cannot be explained by the laws of physics.
B) Since minds are not physical substances, they cannot be perceived (e.g., seen or felt) , leaving no way of determining whether other people have them.
C) Since bodies are not mental substances, they cannot be known through introspection.
D) All of the above