The answer is Reductionism approach. Reductionism is any of a few related philosophical thoughts in regards to the relationship between marvels which can be portrayed as far as other less difficult or more essential wonders. Reductionism emphatically speaks to a specific viewpoint of causality. In a reductionist system, the marvels that can be clarified totally regarding relations between other more central wonders, are named epiphenomena.
The answer is A, cells, as viruses infiltrate cells, make copies of themselves in them, and then lyse the cell and spread.