Answer:
D. Principle of inclusions
Step-by-step explanation:
The principle of inclusion states that fragments of rocks found in other rocks are older than the present rocks that contains them.
The principle sheds light on the relationship between fragments of rocks found in some rock types. For the fragments to have been embedded in the present rock type, it must have definitely be in existence before the present rock type forms.
This principle is used in relative dating of rocks.