Mutation theory based on work over Oenothera lamarckiana was given by,
A. Morgan
B. Mendel
C. De Vries
D. Muller

Hint: Mutation theory based on work over Oenothera lamarckiana states that evolution is a jerky process where new species and many new varieties are formed by the mutation process that serve as raw material of evolution.

Complete answer:
This theory of evolution is called a mutation theory proposed by the botanist Hugo de Vries in 1901. Oenothera lamarckiana is a plant species that was important in the study of genetics and evolution.

> Option A- Morgan: Thomas Hunt Morgan an American biologist is famous for white eyed mutation in the Drosophila. He didn’t give this Mutation theory. Morgan showed after his discovery in DNA that genes are linked to each other in a series of chromosomes which are responsible for identifying hereditary traits.

> Option B- Mendel: Gregor Mendel discovered the fundamental laws of inheritance by working on the pea plant. He is known as the father of modern genetics.

> Option C- Hugo de Vries put forward the theory of evolution called the Mutation theory in 1901. He worked in the field of heredity. This theory states that evolution is a process where new species and new varieties are formed by the mutation process.

> Option D- Muller: Hermann Joseph Muller was an American geneticist known for his work on the physiological and genetic effects of mutagenesis.

Hence, the correct answer is option (C).

Note: Hugo Marie de Varies was a botanist from dutch. He worked on a flowered evening primrose. He is chiefly known for the concept of genes, rediscovering the laws of heredity. He died in the Netherlands in 1935.