It can be inferred form paragraph 2 that Charles Lyell based his study of the marine mollusk fossils on which of the following assumptions? A. The Tertiary Period was separated into division of time that were equal in length. B. Mollusks lived under rocks in the sea during the Tertiary period. C. Evolution of mollusks proceeded at a uniform rate over time D. Mollusks have evolved less rapidly with the passing of time