Final answer:
Louis Pasteur (option B ) disproved the theory of spontaneous generation with his swan-neck flask experiments and proved the Theory of Biogenesis.
Step-by-step explanation:
The individual who is credited with disproving the theory of spontaneous generation and proving the Theory of Biogenesis is Louis Pasteur. He conducted experiments using broth in swan-neck flasks to demonstrate that life does not spontaneously arise from nonliving material. Instead, he proved that microbes present in the air are responsible for the appearance of life in nutrient solutions. This put an end to the long-standing spontaneous generation debate.
Another significant contribution in this field was made by Francesco Redi, who used jars with meat and different levels of exposure to flies to show that maggots on meat come from flies and not from the meat itself, which was an earlier step in refuting spontaneous generation.