Polymer J contains the repeat unit $[-\text{CH}(-\text{C}_2\text{H}_5)\text{CH}(-\text{CH}_3)-]$. Polymer K contains the repeat unit $[-\text{CH}(-\text{CH}_3)\text{CH}(-\text{CH}_3)-]$. Which row is correct?
- Amonomer for J: pent-1-ene; monomer for K: but-1-ene
- Bmonomer for J: pent-1-ene; monomer for K: but-2-ene
- Cmonomer for J: pent-2-ene; monomer for K: but-1-ene
- Dmonomer for J: pent-2-ene; monomer for K: but-2-ene