Answer the following question given this paragraph: 

An addition polymer is a polymer formed by chain addition reactions between monomers that contain a double bond. Molecules of ethene can polymerize with each other under the right conditions to form the polymer called polyethylene.


Q: What is  a polymer formed by chain addition reactions between monomers that contain a double bond called?

 Choices:

- a linear polymer

- a branched polymer

- an addition monolayer

- an addition polymer

A:
an addition polymer
