Final answer:
Butyl hydroperoxide is an example of a Class "C" oxidizing material, as it has the capability to act as an oxidant in chemical reactions by releasing oxygen. Oxidizing materials can cause other substances to combust.
Step-by-step explanation:
An example of a Class "C" oxidizing material among the options provided would be butyl hydroperoxide. Oxidizing chemicals are substances that contain oxygen or another electronegative element which can cause other materials to combust by providing an oxygen source or removing electrons. Butyl hydroperoxide has the capability to act as an oxidant in chemical reactions, releasing oxygen and potentially causing combustion. Materials like potassium dichromate are also examples of strong oxidizers.
In the context of oxidation states and reactions, compounds with elements in high oxidation states, such as ClO, NO, MnO2, Cr2O7^2-, and UF6, tend to be strong oxidants and thus, get reduced during chemical reactions. Calcium oxide, mentioned in the reference, has many industrial uses and can act as a base, but it is not an oxidizing agent that would fit the criteria for a Class "C" material in this context.