Brainliest for whoever me with number 4 correctly and quickly in about 10 mins max.

A.) Producing images of DNA molecules using X-ray

Explanation:

Franklin is best known for her work on the X-ray diffraction images of DNA, particularly Photo 51, while at King's College London, which led to the discovery of the DNA double helix for which James Watson, Francis Crick and Maurice Wilkins shared the Nobel Prize in Physiology or Medicine in 1962.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project