Question: if we find a dinosaur fossil and in the same...

If we find a dinosaur fossil, and in the same rock there is a crystal which can be radiometrically dated, and we get a date of 237 mya from that crystal, what age are we measuring?

a. The age of the Earth.

b. The age of the sedimentary rock in which it was found.

c.	The age when the crystal was formed in an igneous rock.

d. The age of the dinosaur.