The correct answer to the question is option 4, Caventou and Pelletier. Caventou and Pelletier were French chemists who worked together to isolate and name chlorophyll. They conducted experiments in the early 19th century and were able to separate the green pigment from plant leaves and identify its chemical properties. They named this pigment "chlorophyll," which comes from the Greek words "chloros" meaning green and "phyllon" meaning leaf. Caventou and Pelletier`s discovery of chlorophyll was a significant contribution to the field of botany and our understanding of photosynthesis. It is important to note that options 1, 2, and 3 are incorrect, as they refer to individual scientists and not the joint efforts of Caventou and Pelletier.