A researcher investigates two routes for producing a polyester.
| Route | Molecules used | Functional groups in each molecule |
|---|---|---|
| 1 | A only | one -OH\text{-OH}-OH group and one -COOH\text{-COOH}-COOH group |
| 2 | B and C | B has two -OH\text{-OH}-OH groups; C has one -COOH\text{-COOH}-COOH group |
Which route could produce a polyester containing long chains? Explain your answer and why the other route could not produce long chains.