Concept:
Synonyms are words having similar meanings.
Step 1: Find synonym of “Docile”.
“Docile” means obedient or submissive.
Thus:
\[
A \rightarrow III
\]
Step 2: Find synonym of “Diligent”.
“Diligent” means hardworking.
Thus:
\[
B \rightarrow IV
\]
Step 3: Find synonym of “Reluctant”.
“Reluctant” means unwilling.
Thus:
\[
C \rightarrow II
\]
Step 4: Find synonym of “Jubilant”.
“Jubilant” means extremely happy or ecstatic.
Thus:
\[
D \rightarrow I
\]
Step 5: Write the final matching.
\[
A-III,\; B-IV,\; C-II,\; D-I
\]
Step 6: Conclusion.
Hence, the correct answer is:
\[
\boxed{A-III,\; B-IV,\; C-II,\; D-I}
\]