The correct option is D Apoptosis
Apoptosis is the process in living cells which results in the death of cells that are damaged, attacked by pathogens, cancerous cell, abnormal cell, etc. Such cells are identified by the cells of the immune system followed by the production of proteins that kills the cell by DNA cleavage. It is also called programmed cell death. This phenomenon of apoptosis can be exploited for cancer treatment. Thus the correct answer is option C.