Why is it difficult to assign a numerical age to a sedimentary rock?
a. A radiometric date taken from a grain within a detrital sedimentary rock only gives the age of that one grain, which likely came from a source different from the other grains within the rock.
b. Organic material that is sometimes present within sedimentary rocks interferes with the results of radiometric dating.
c. Sedimentary rocks are created at Earth's surface, where radioactive decay occurs at different rates than the rates inside Earth.
d. A radiometric date taken from a sedimentary rock only gives the age of when that rock lithified and does not take into consideration the age(s) of the material(s) that make up the rock.
e. Sedimentary rocks never contain isotopes useful for radiometric dating.