The correct answer is:
a
Radiocarbon dating is Absolute dating which will determine the exact age of the fossil, and therefore also its rock layer. Once they know the age of this layer, they can estimate the ages of the adjacent rock layers above and below it through relative aging.
Radiocarbon dating provides a specific age for organic materials up to about 50,000 years old, helping scientists establish a timeline for the sedimentary rock layers surrounding the fossil. From this known age, they can then apply principles of relative dating, such as the law of superposition, to estimate the ages of other rock layers in relation to the dated fossil.