A polymer is made from compound R, HO-(CH2)4-OH\text{HO-(CH}_2\text{)}_4\text{-OH}HO-(CH2)4-OH, and compound S, HOOC-(CH2)2-COOH\text{HOOC-(CH}_2\text{)}_2\text{-COOH}HOOC-(CH2)2-COOH.
The end groups of adjacent molecules react as the polymer chain grows.
Which statement describes what happens each time a new link forms?
No other molecule is produced as each new link forms.
Water becomes part of the polymer at each new link.
A peptide link forms as the molecules join.
Water is released as each new link forms.