The two monomers for the synthesis of nylon 6, 6 are

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1. A$HOOH{\left({\text{ CH }}_{2}\right)}$_{4}COOH, {H}_{2}N{\left({CH}_{2}\right)}_{4}{NH}_{2}
2. B$HOOC{\left({\text{ CH }}_{2}\right)}$_{4}COOH, {H}_{2}N{\left({CH}_{2}\right)}_{6}{NH}_{2}
3. C$HOOC{\left({\text{ CH }}_{2}\right)}$_{6}COOH, {H}_{2}N{\left({CH}_{2}\right)}_{4}{NH}_{2}
4. D$HOOC{\left({\text{ CH }}_{2}\right)}$_{6}COOH, {H}_{2}N{\left({CH}_{2}\right)}_{6}{NH}_{2}