Answer;
c. It led to the development of contact-inhibition regulators.
Step-by-step explanation;
-While normal cells possess mechanisms that inhibit proliferation when conditions are inappropriate, tumor cells circumvent these mechanisms and continue proliferating.
-Contact inhibition is a process of arresting cell growth when cells come in contact with each other. As a result, normal cells stop proliferating when they form a monolayer in a culture dish. Contact inhibition is a powerful anticancer mechanism that is lost in cancer cells.