(A) Robert Brown
(B) Mikhail Tsvet
(C) Joseph Dalton
(D) None of these
🧠 Explanation:
Chromatography was discovered by **Mikhail Tsvet**, a Russian botanist, in the early 20th century. He developed this technique in 1903 while studying plant pigments, using a column filled with calcium carbonate to separate chlorophyll and other compounds. The word “chromatography” comes from the Greek words *chroma* (color) and *graphein* (to write), reflecting its use in separating colored substances. Today, chromatography is widely applied in chemistry, biology, and forensic science to separate and analyze mixtures. In grammar, “Mikhail Tsvet” is a **proper noun** naming the scientist. Alternatives in context could be “invented by Tsvet” or “pioneered by Mikhail Tsvet.”