What is a natural part of aging?\nOptions:\n- (A) Smoking\n- (B) apoptosis\n- (C) regeneration\n- (D) illness\n- (E) stimulation\n- (F) cracking\n- (G) Weight\n- (H) firm skin
Let's think step by step.
(B)
Aging is associated with the death of cells.

Apoptosis means cell death.

Apoptosis is a natural part of aging.

.

Final answer: (B)