I'm pretty sure I picked the right answer but on the question I found, it had multiple responses of different answers, so please help.

Plastics are large organic molecules called polymers.

Explanation:

Plastics can be defined as materials that can be shaped when soft and then hardened to keep their shape. They are synthetic (artificially made) or semi-synthetic, derived from materials found in nature, such as natural gas, oil, coal, minerals, and plants.

As they are derived from natural, organic materials, plastics also consist of organic molecules. Their molecules are very large and long and consist of many repeating subunits. Materials with this type of structure are called polymers.

This is why the second option is the correct one.