Directions: In the following question, four statements are provided. These statements form a coherent paragraph when properly arranged. Select the alternative representing the proper and logical sequencing of these statements.

A. That question raises the issue of purpose in Nature.

B. Under these conditions, is it not more natural, more logical, and simpler to maintain provisionally - pending additional discoveries - that the miracles of life, and especially those of cellular life, are the work of the cell itself?

C. Does the rationality of Nature prove that it acts according to a deliberate plan directed towards an end to which everything has been subordinated?

D. To the extent that we penetrate farther and farther into the mysteries of vegetable and animal life and come to know better and better the multiple mechanisms, often opposed to one another, which release control and direct the behavior of the tiniest bacteria and the humblest cells of living creatures, we perceive that the marvels of ingenuity and apparent foresight which biology reveals to us are to be explained by the breakdowns of electrical and biochemical equilibria brought about by clearly defined compounds, enzymes or hormones, secreted by the living cells under the influence of the pleasant and unpleasant reactions which they experience.