Concept:
Antonyms are words with opposite meanings.
Step 1: Find the antonym of “Inevitable”.
“Inevitable” means unavoidable.
Its opposite is:
\[
\text{Avoidable}
\]
Thus,
\[
A \rightarrow I
\]
Step 2: Find the antonym of “Humility”.
“Humility” means modesty.
Its opposite is:
\[
\text{Pride}
\]
Thus,
\[
B \rightarrow III
\]
Step 3: Find the antonym of “Duplicity”.
“Duplicity” means deceitfulness.
Its opposite is:
\[
\text{Honesty}
\]
Thus,
\[
C \rightarrow II
\]
Step 4: Find the antonym of “Frailty”.
“Frailty” means weakness.
Its opposite is:
\[
\text{Strength}
\]
Thus,
\[
D \rightarrow IV
\]
Step 5: Write the final matching.
\[
A-I,\; B-III,\; C-II,\; D-IV
\]
Step 6: Conclusion.
Hence, the correct answer is:
\[
\boxed{A-I,\; B-III,\; C-II,\; D-IV}
\]