As Understood by Modern Geologists,the Principle of Uniformitarianism Implies That

As understood by modern geologists,the principle of uniformitarianism implies that ____________.

A) the Earth has always had the same basic appearance that it has today,with the distributions of ocean basins and continents identical to what we see today
B) igneous,metamorphic,and sedimentary rocks are uniformly mixed throughout the crust of the Earth
C) physical processes observed today (such as erosion and volcanic eruption) have been active in the past and are responsible for the geologic history we see preserved in the rock record
D) physical processes observed today (such as erosion and volcanic eruption) have been occurring throughout Earth history at constant rates;for example,no eruption in geologic time would have been greater than the 1815 Tambora eruption