Answer: Option (b) is the correct answer.
Step-by-step explanation:
A synthesis reaction is the reaction in which two compounds or atoms combine together to result in the formation of a single compound.
For example,
![CaO + CO_(2) \rightarrow CaCO_(3)](https://img.qammunity.org/2019/formulas/chemistry/high-school/is2zdvfm9mit0r2ks7h1tjty7udbvmvz7q.png)
Thus, here CaO and
combine together to result in the formation of calcium carbonate compound. Therefore, it is a synthesis reaction.
Therefore, we can conclude that the most likely products of Cao + co2 → CaCO3 reaction.