Answer:
B. A scientific law
Step-by-step explanation:
A scientific law is a statement that explains an idea or phenomenon based on thoroughly experimental observations. Scientific laws are widely accepted to be true based on the fact that they have always been observed to be true. A scientific law can be in the form of words or it can be expressed as a mathematical formula. Examples of scientific laws include; the laws of thermodynamics, Hook’s law of elasticity, law of gravity and Boyle’s law of gases.