Which Is Most Analogous to the Role of GFP in Recombinant

Which is most analogous to the role of GFP in recombinant DNA technology?

A) Using dyes to stain and detect bacteria under light microscopy from the sputum of a patient diagnosed with tuberculosis.
B) Comparing the RFLP patterns of DNA from various suspects to DNA isolated from the scene of a crime using gel electrophoresis.
C) Creating a metagenomic library representing archaea bacteria that thrive in the hot springs of Yellowstone National Park.
D) Monitoring the spread of multi-drug resistant pathogens on a hospital floor by comparing antibiotic susceptibility patterns.