Step 1: Identify the first hybrid varieties.
- Maize: Ganga-1 (IV)
- Jowar: CSH-1 (I)
- Bajra: HB-1 (III)
- Cotton: H-4 (II)
Step 2: Establish the correct pairings. \[\begin{aligned}(A) &\rightarrow (IV) \text{Maize - Ganga-1}
(B) &\rightarrow (I) \text{Jowar - CSH-1}
(C) &\rightarrow (III) \text{Bajra - HB-1}
(D) &\rightarrow (II) \text{Cotton - H-4}
\end{aligned}\]
Step 3: Compare with the given options.
The established pairings precisely match Option 2.
Final Answer: \[\boxed{\text{The correct answer is 2. (A) - (IV), (B) - (I), (C) - (III), (D) - (II)}}\]