A single molecule of an addition polymer with 2000 repeat units has an $M_r$ of $112000$. The polymer molecule contains chiral centres. Which monomer could be a possible precursor for this polymer?
- A$\text{CH}_2=\text{CHCH}_3$
- B$\text{CH}_2=\text{C(CH}_3)_2$
- C$\text{CH}_2=\text{CHCH}_2\text{CH}_3$
- D$\text{CH}_2=\text{CHCH}_2\text{CH}_2\text{CH}_3$