Disproportionation is a process in which a substance can act only as a reducing agent. can act only as an oxidizing agent. is both an oxidizing and a reducing agent. is neither an oxidizing nor a reducing agent.

Disproportionation is a process in which a substance acts as
C) both an oxidizing and a reducing agent.

In disproportionation, a compound breaks down into two compounds, with one acting as an oxidizing agent and one as a reducing agent. It is important to note that it is not the original compound acting as both, but two distinct product compounds. 

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is