Answer:
The correct answer is investigation
Step-by-step explanation:
Investigation here means scientific investigation or experiment. In scientific process, when a new phenomenon is observed, an hypothesis is made in an attempt to explain the concept behind the observation. An experiment/investigation is then embarked upon to determine if the hypothesis provides the right answer or perspective to this observation. The outcome/conclusion of this experiment after repeated trials is referred to as theory while a theory tested over a long period of time is a law.
However, if the experiment doesn't confirm the hypothesis, new questions or hypothesis will have to be proffered