Which One of the Following Observations and Inferences Is Most

Multiple Choice

Which one of the following observations and inferences is most consistent with the idea of uniformitarianism?

A) The number of erupting volcanoes is constant throughout geologic time, so this is not a big influence on changing climates.
B) Sand rolls along a stream bottom at the same rate every hour, every day, year in, year out.
C) Meteorite impacts always occur at regular intervals and this has forced biologic evolution.
D) Mountains are dissolved and/or eroded mechanically one ion and one mineral grain at a time and carried down to the sea.