Question

carbon dating and other similar methods calculate age of a sample by quantifying the amount of
a nuclear fusion.
b photosynthesis.
c radioactive decay.
d electrons in a sample.

Explanation:

Carbon - dating is a radiometric dating method. It works by measuring the amount of radioactive carbon - 14 (which undergoes radioactive decay) in a sample to determine its age. Nuclear fusion is the process of combining atomic nuclei, photosynthesis is the process by which plants convert light energy into chemical energy, and electrons in a sample are not related to carbon - dating for age calculation.

Answer:

C. radioactive decay