The correct option is B A - ii, B - iii, C - v, D - i
Franceso Redi was an Italian naturalist who was the first to challenge and disprove the theory of spontaneous generation.
Louis Pasteur was French biologist who devised the swan necked flask experiment to disprove the theory of sponatneous generation. This experiment led to the elucidation of the germ theory of disease.
Hermann E Richter is associated with the hypothesis of panspermia, which says that life exists throughout the universe.
Alexander Ivanovich Oparin was a Russian biochemist who performed experiments to study the origin of life and came up with the theory of chemical evolution.