The correct answer is C. Autoradiography.
Autoradiography is a technique used to visualize the distribution of radioactively labeled molecules in cells and tissues. It is based on the principle that radioactive decay emits particles that can be detected on a photographic film. When a radioactively labeled molecule is incorporated into a cell or tissue, the decay particles will expose the film in a pattern that corresponds to the distribution of the molecule. This pattern can then be used to identify the location of the molecule in the cell or tissue.
Centrifugation is a technique used to separate particles based on their density. It is based on the principle that denser particles will sediment to the bottom of a centrifuge tube faster than less dense particles. This technique can be used to separate cells, organelles, and other particles from a cell or tissue.
Chromatography is a technique used to separate mixtures of molecules based on their different chemical properties. It is based on the principle that molecules will travel through a chromatography column at different rates depending on their affinity for the stationary phase in the column. This technique can be used to separate proteins, DNA, and other molecules from a cell or tissue.
Therefore, the correct answer is C. Autoradiography.