Recall the principle of adsorption chromatography

In adsorption chromatography, the stationary phase is a solid adsorbent. Commonly used adsorbents are:

• Silica gel
• Alumina

Check each given substance

• A. Silica gel: Yes, it is a standard adsorbent used in chromatography.
• B. Alumina: Yes, it is also a standard adsorbent used in chromatography.
• C. Quick lime ($\mathrm{CaO}$): No, it is not a usual adsorbent for adsorption chromatography.
• D. Magnesia ($\mathrm{MgO}$): Not taken as the standard adsorbent here for adsorption chromatography in this context.

Identify the correct combination

Thus, the adsorbents used are: $\text{A and B only}$

Match with the options

• Option A: C and D only $\to$ incorrect
• Option B: A only $\to$ incorrect
• Option C: B only $\to$ incorrect
• Option D: A and B only $\to$ correct

Final answer

$\boxed{\text{Option D: A and B only}}$

Comparison with stored correct answer

Stored correct answer = D

My derived answer = D

Hence, they agree.