Final answer:
The germ theory of disease has become a Scientific Law as it has been extensively tested and confirmed through scientific investigations and experiments in the field of biology. Hence the correct answer is option A
Step-by-step explanation:
The germ theory of disease has been so thoroughly tested that it has become a Scientific Law. A scientific theory is a broad explanation for events that is widely accepted because it is supported by a great deal of evidence. The germ theory of disease proposes that microorganisms are the cause of many diseases. This theory has been extensively tested and confirmed through scientific investigations and experiments, making it a scientific law in the field of biology.
Hence the correct answer is option A