How Can Radiometric Dating Yield Reliable Values for the Ages

How can radiometric dating yield reliable values for the ages of minerals, rocks and some fossils?

A) One only needs to analyse for the parent isotope.
B) The decay constants are fixed and well measured for isotopic decay.
C) There are absolute fossil ages to compare to and test the radiometric clocks.
D) The physical conditions that control decay, like temperature and pressure, are always well known.

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