Step 1: Understanding the Concept:
This question asks for the antonym of the verb CONTROVERT. To controvert means to argue against, dispute, or deny the truth of something. It is the root of "controversy."
Step 2: Detailed Explanation:
We are looking for a word that means the opposite of denying or disputing. The opposite action would be to confirm, prove, or support something.
Let's analyze the options:
\begin{itemize}
\item (A) substantiate: To provide evidence to support or prove the truth of something. This is a direct antonym for controvert.
\item (B) transform: To change. Not an opposite.
\item (C) ameliorate: To make something bad better. Not an opposite.
\item (D) simplify: To make easier to understand. Not an opposite.
\item (E) differentiate: To recognize what makes something different. Not an opposite.
\end{itemize}
Step 3: Final Answer:
The best antonym for CONTROVERT is SUBSTANTIATE.