The correct answer is option D.
Dating a mineral within a metamorphic rock gives the age when the rock cooled below the closure temperatures of that mineral.
The method to date a mineral by using radioactive isotopes within a metamorphic rock to determine its age is called radiometric dating.
In general, minerals are found in organic matter such as wood, shells and bones, and rocks. Radioactive isotopes are found in minerals. The comparison between the parent and daughter isotopes can be used to determine the age of the mineral.
Only igneous rocks can be dated radio-metrically due to their single date of origin. However, both metamorphic and sedimentary rocks can not be dated.
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