What scientific term is a well-tested explanation for a set of observations or experimental results? method law conclusion theory

The correct option is D. Theory

Explanation:

The scientific method of research begins with a question.

To answer this question, a hypothesis is made. A hypothesis can be described as a tentative statement which is testable.

To test the validity of a hypothesis, observations and experiments are made. Based on the results from the observations and experiments, results are drawn and conclusions are made.

A scientific theory is a wide description for a hypothesis which is well tested again and again by observations and experiments. However, with time a scientific theory might change if new researchers are made.