Final answer:
Louis Pasteur disproved spontaneous generation, showing that (B) life does not spontaneously arise from nonliving matter, but instead, life comes from pre-existing life, a concept known as biogenesis.
Step-by-step explanation:
The findings of Louis Pasteur and others have firmly established that living organisms do not arise from nonliving matter today, nor did they in the past, a concept known as biogenesis. Pasteur's experiments, particularly the swan-neck flask experiment, demonstrated that microorganisms from the air were responsible for the appearance of life in sterilized nutrient broths, thereby disproving the theory of spontaneous generation.
Additionally, Charles Darwin had already postulated that life may have begun in a 'warm little pond' with the right conditions on early Earth, suggesting the possibility of a naturalistic origin of life. This view is supported by scientific evidence from varied disciplines and by the findings of experiments conducted by scientists like Stanley Miller and Harold Urey in the 1960s. These experiments showed that organic compounds could form under early Earth conditions, which is a hypothesis for how life may have evolved on Earth.