The correct option is
C I- B, II- A, III- D, IV- C
To account for polymorphism Weismann developed hypothesis of germinal selection. He said that the germplasm has got not a single set of determiners but a number of different sets of determiners. It is the environment that decides which set of determiners will express themselves.
Etienne Geoffroy Saint-Hilaire was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Variation and Evolution in Plants is a book written by G. Ledyard Stebbins, published in 1950. Modified form of Lamarckism is neo lamarckism.
Therefore, the correct answer is option C.