The correct option is D Johannsen
McClintock
McClintock discovered transposable elements by her experiments on maize.
Morgan
Morgan established the chromosomal theory of heredity via his experiments on the fruit fly or Drosophila melanogaster.
Johannsen
The term gene was coined by Johanssen in 1909. According to him a gene is an elementary unit of inheritance which can be assigned to a particular trait.
De Duve
De Duve discovered the lysosomes and peroxisomes and also coined the terms autophagy, endocytosis and exocytosis.
Final answer
(C) Johannsen