The Principle of Inclusions Which States That the Source of Rock

The principle of inclusions which states that the source of rock fragments found in a unit must be older than the unit with the fragments is important because ________.

A) it provided a tool for sorting out the relative timing of various geologic events
B) it provided a way to recognize if rocks had been deformed
C) it showed that igneous rocks were younger than sedimentary rocks
D) it allowed geologists to correlate rock units over large distances