Oxides are:
a. only formed during incomplete combustion.
b. products formed during combustion.
c. products formed during double replacement reactions.
d. reactants in combustion.

The correct answer is Option B.

Explanation:

Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule. The chemical equation for this reaction follows:

Incomplete combustion is defined as the reaction in which supply of oxygen is limited and carbon monoxide gas is also produced as a product. The chemical equation for this reaction follows:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element.

Element C is more reactive than element A.

As, we can see that oxides are the products in both complete combustion reaction and incomplete combustion reaction.

Hence, the correct answer is Option B.

the answers are

c and c