Answer:
Option (2)
Step-by-step explanation:
Celtic runes sites refers to some of the places in the northern part of Europe whose common scripts are the Celtic runes.
The remnants of wooden structures are discovered in this place by the scientists, and in order to determine the time, that is, when the stones were carried by the Celts into the mentioned place, the most efficient way of determining this time will be the carbon dating method.
The carbon dating method is efficiently used to date an object that are of very recent age. It is because the half life of carbon is approximately 5700 years, which is geologically a very small age.
Thus, the correct answer is option (2).