Answer: The carbon and hydrogen atoms fight for the electrons.
Step-by-step explanation:
Redox reactions are defined as the reactions in which reduction and oxidation reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of this substance is increased and the substance gets oxidized.
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of this substance gets reduced and the substance gets reduced.

In a redox reaction, one atom loose electrons and another atom gains electrons.
For the given chemical reaction:

Oxidation half reaction:

Reduction half reaction:

As, carbon is loosing electrons. so, it is getting oxidized and hydrogen is gaining electrons. So, it is getting reduced.
Hence, the carbon and hydrogen atoms fight for the electrons.