It can be inferred from the passage that some scientists assume which of the following concerning "larger, more complex molecules" A. The earliest atmosphere was formed primarily of these molecules. B. Chemical processes involving these molecules proceeded much more slowly under primitive Earth conditions. C. The presence of these molecules would necessarily precede the existence of simple organisms. D. Experimental techniques will never be sufficiently sophisticated to produce in the laboratory simple organisms from these chemical constituents. E. Explanations could easily be developed to explain how simple molecules combined to form these more complex ones.