The correct answer is B. Ask a question based on an observation
Step-by-step explanation:
The Scientific Method is a process with multiple steps that allow scientist and individuals to study a phenomenon and prove or disprove a hypothesis. This method includes first observing a phenomenon, defining it and asking questions; research on the topic if necessary; then creating a hypothesis or possible explanation; testing the hypothesis through experiments; analyze and interpret the data; publish the results and finally suing more experiments if necessary. According to this, the step that is first done in the Scientific Method is "Ask a question based on an observation" because this goes before any other steps.