Step 1: Chemical Nature
Ammonia ($NH_{3}$) is a basic gas.
Step 2: Evaluation of Agents
- $CaCl_{2}$ reacts with $NH_{3}$ to form an addition compound ($CaCl_{2} \cdot 8NH_{3}$).
- $P_{2}O_{5}$ (acidic) reacts with $NH_{3}$ (basic).
- Quick lime (CaO) is basic and does not react with $NH_{3}$.
Step 3: Answer Analysis
Quick lime is the suitable drying agent.
Hence, the Answer is: (D)