Step 1: Recall the functions of neuroglial cells.
\[
\begin{aligned}
\text{Astrocytes} &\rightarrow \text{Blood--brain barrier}
\text{Oligodendrocytes} &\rightarrow \text{Myelin sheath in CNS}
\text{Microglial cells} &\rightarrow \text{Phagocytes of CNS}
\text{Schwann cells} &\rightarrow \text{Neurilemma and myelin sheath in PNS}
\end{aligned}
\]
Step 2: Match the lists.
\[
\boxed{
A-V,\qquad
B-III,\qquad
C-I,\qquad
D-II
}
\]
Step 3: Choose the correct option.
Hence,
\[
\boxed{(C)}
\]
is the correct answer.