Which of the Following Statements About Earth's History Is True

Which of the following statements about Earth's history is true?

A) A paleontologist can determine the age of a rock by its appearance alone.
B) In all sedimentary rock, the oldest layers lie at the bottom, and successively higher strata are progressively younger.
C) Sedimentary rock forms via the accumulation of grains at the bottoms of rivers and other bodies of water.
D) The continents have always been where they are today.
E) None of the above