I'll give you a question, please answer with step-by-step reasoning process.
The loss in length of what causes cells to age?\nOptions:\n- (A) fur and fat\n- (B) layers of fat\n- (C) cell membrane\n- (D) sunlight\n- (E) Chlorophyll\n- (F) telomeres\n- (G) programmed cell death\n- (H) cancer

(F)
Aging occurs as cells lose their ability to divide.

Portions of the telomeres are lost each time a cell divides.

Aging occurs as cells lose their telomeres.

.

Final answer: (F)