The correct option is B Reiter
Odum is known as the Father of modern ecology. He says that “Ecology is the study of structure and function of ecosystems”.
The term ecology is believed to have been coined by Ernst HaecKel (1869) though its first authentic use was made by Reiter (1885).
Reiter was the first person to use the word ecology. The great scientist Ernst Haeckel was given credit to coin and express the definition of the term “Ecology”.