In a Condensation Polymerization Process, What Happens to Form the Polymer

In a condensation polymerization process, what happens to form the polymer chain?

A) small molecules such as water are split out and monomers are linked
B) small molecules such as water are required for the bonding link
C) small molecules may be split out or required depending on whether an ester or an ether linkage is formed
D) small molecules such as water are moved from one position to another