To answer this question, you need to understand the reaction between HCl (hydrochloric acid) and marble chips (calcium carbonate).
When HCl is poured on marble chips, it reacts with the calcium carbonate in the marble chips to produce carbon dioxide gas. This is a common reaction known as a neutralization reaction.
The balanced chemical equation for this reaction is:
HCl + CaCO3 → CaCl2 + CO2 + H2O
From the equation, we can see that carbon dioxide gas (CO2) is evolved as a product of the reaction.
Therefore, the correct answer is:
A. Carbon Dioxide