Which of the Following Are Valid Criteria for Inferring the Relative

Multiple Choice

Which of the following are valid criteria for inferring the relative ages of the two rock types in this photograph?

A) The black rock is younger because it is on the bottom.
B) The tan rock is younger because it contains pieces of the black rock.
C) The black rock is younger because it is crosscut by the tan rock.
D) The evidence is contradictory about the relative ages of these two rocks.