Concept:
Insect pests are identified by their common names and scientific names.
Step 1: Pod borer of gram.
Pod borer of gram is:
\[
\textit{Helicoverpa armigera}
\]
So,
\[
A\rightarrow III
\]
Step 2: White fly.
White fly is:
\[
\textit{Bemisia tabaci}
\]
So,
\[
B\rightarrow IV
\]
Step 3: Cut worm.
Cut worm is:
\[
\textit{Agrotis ipsilon}
\]
So,
\[
C\rightarrow I
\]
Step 4: Thrips.
Thrips is:
\[
\textit{Caliothrips indicus}
\]
So,
\[
D\rightarrow II
\]
Therefore:
\[
A-III,\ B-IV,\ C-I,\ D-II
\]
\[
\therefore \text{Correct Answer is (A)}
\]