Step 1: We know that:
\begin{itemize}
\item Glut is a protein responsible for transporting glucose, so it is associated with Enabling glucose transport into cells (IV).
\item Antibody helps in fighting infections, so it is associated with Fighting infectious agents (III).
\item Trypsin is an enzyme that breaks down proteins, so it is associated with Enzyme (II).
\item Insulin is a hormone that regulates glucose metabolism, so it is associated with Hormone (I).
\end{itemize}