Ascientist begins working by trying to explain a natural occurrence that is

Here is the full statement: A scientist begin working by trying to explain a natural occurrence that is OBSERVABLE.

Scientific method refers to the techniques that scientists used to carry out scientific investigations and it is made up of series of steps. The first step is observation. A scientist normally begin the process of scientific investigation by observing a phenomenon that occur naturally. The observation will lead to questions, which need to be answered and which eventually lead to conduction of experiments.

3 ) is your answer, hope it helps , good afternoon.