Step 1: Match Invertase.
Invertase is the enzyme that hydrolyses sucrose into glucose and fructose.
Thus,
\[
\text{Invertase} \rightarrow \text{Sucrose} \rightarrow \text{Glucose + Fructose}
\]
Hence,
\[
A \rightarrow II
\]
Step 2: Match Pepsin.
Pepsin is a digestive enzyme present in the stomach.
It converts proteins into peptides.
Therefore,
\[
\text{Pepsin} \rightarrow \text{Proteins} \rightarrow \text{Peptides}
\]
Hence,
\[
B \rightarrow III
\]
Step 3: Match Diastase.
Diastase is an enzyme that converts starch into maltose.
Thus,
\[
\text{Diastase} \rightarrow \text{Starch} \rightarrow \text{Maltose}
\]
Hence,
\[
C \rightarrow IV
\]
Step 4: Write the correct matching.
Therefore, the correct matching is:
\[
A-II,\ B-III,\ C-IV
\]
Step 5: Final conclusion.
Hence, the correct answer is
\[
\boxed{A-II,\ B-III,\ C-IV}
\]