Answer:
B. relative dating
Step-by-step explanation:
The scientist is using the concepts of relative dating to determine the age of the two fossils he has.
- Relative dating involves ascribes ages to rocks or fossils based on their relationship in a sequence.
- Relative dating is made possible by series of laws and principles.
- Some of the principles are "the law of superposition", "principle of original horizontality", "Principle of fossil and fauna succession", "Principle of lateral continuity".
These principles helps to ascribe the right relative ages to rock strata and the fossils they contain.