Final answer:
The critical concentration (Cc) of actin monomers represents the balance between monomers joining and dissociating from the polymer.
Step-by-step explanation:
The true statement regarding the critical concentration (Cc) of actin monomers is that it represents the concentration at which there is a balance between actin monomers dissociating from the polymer and actin monomers joining the polymer. Above the Cc, the polymer will continue to grow, while below the Cc, the polymer will depolymerize.