The oxidation number of carbon changes from -1 to +4.
the oxidation number of oxygen changes from 0 to -2.
carbon is oxidized.
oxygen is reduced.
electrons are transferred from carbon to oxygen.

Carbon is oxidized because to increase of its oxidation number.
Oxygen is reduced because to decrease of its oxidation number.
If the oxidation number increase, the element is giving electrons. Electrons are transferred from the oxidized atom to the reduced atom.

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Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2