Final answer:
In a double-replacement reaction between KBr and CaO, the products would be calcium bromide (CaBr2) and potassium oxide (K2O), following the typical exchange pattern seen in such reactions.
Step-by-step explanation:
The student has asked about the products of a double-replacement reaction between potassium bromide (KBr) and calcium oxide (CaO). A double-replacement reaction generally follows the form AB + CD → AD + BC. In this type of reaction, the cations and anions switch places.
Considering solubility rules which are not directly provided for KBr and CaO but are relevant for predicting the outcome, we can deduce that the reaction would likely produce calcium bromide (CaBr2) and potassium oxide (K2O) based on the exchange process. Thus, the correct answer from the given options would be C. CaBr2 and K2O.