Answer: Effect
Step-by-step explanation:
Research questions are demonstrated as the questions that directs or specifies the dimension of the research for a particular work and helps to determine the objectives of the paper or essay.
As per the question, while writing or farming research questions, action verb like 'effect' must be used as it would help determine the impact of a particular research question on the content and efficacy of the research and thus, frame questions that propose a clear, concise, intricate, and debatable thesis statement and offer an effective dimension to the essay that creates a valid impact on the audience.