Correct Answer: Option A

Explanation

The chemical formula C\(_2\)H\(_4\) represents ethene (also known as ethylene), which is the simplest alkene containing a double covalent bond between two carbon atoms.During addition polymerization, the double bond between the carbon atoms in the ethene monomers breaks under high pressure and temperature. These monomers link together in a long chain of repeating units to form polyethene (or polyethylene), a widely used plastic. 

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