The correct answer is D. Indemnity.
Indemnity is a legal principle that requires an insurer to restore an insured person to the same financial position they were in before the loss occurred. This means that the insurer would assess and compensate only the exact amount of loss.
Certainty is the state of being sure or known for sure. Uncertainty is the state of being unsure or not known for sure. Probability is the likelihood of something happening.
In the context of insurance, certainty, uncertainty, and probability are all important concepts. However, indemnity is the most important concept, as it is the foundation of insurance law.