The formula shows the repeat unit of an addition polymer, $-\text{CH}(\text{CH}_3)\text{CH}(\text{CH}_2\text{CH}_3)-$. What is the correct name of the monomer from which this polymer is produced?
- A1-methyl-2-ethylethene
- B1-ethylprop-1-ene
- Cpent-2-ene
- Dpent-1-ene