What is defined as an observation that has been repeatedly proven?

A fact is defined as an observation that has been repeatedly proven and is widely accepted as true. In scientific contexts, a fact is based on empirical evidence collected through observation and experimentation that demonstrates consistency across multiple instances. This regularity in observations allows the scientific community to accept these findings as factual.

In contrast, a theory is an overarching explanation for a set of related observations or phenomena supported by a significant body of evidence but may still be subject to further testing and refinement. A hypothesis is a testable prediction made before conducting an experiment, and an inference is a conclusion drawn based on observations but can include assumptions rather than established facts. Hence, a fact represents the most reliable and confirmed type of observation in science, solidifying its status as the correct answer.