The is a tool for gaining knowledge in a field that relies on observations of phenomena and allows for tests of hypotheses about these phenomena.

scientific method

Explanation:

Scientific method -

It is the method by which information is gathered by testing , experiments and observation , about a specific topic , is referred to as scientific method.

The method is very important while studying a particular topic of interest .

The method employs many experiments , prior data , hypothesis , assumptions and testing to get to final decision.

Hence, from the information of the question,

The correct answer is scientific method.