Answer:
b) Segment the data by conversion action.
Step-by-step explanation:
Based on the information provided within the question it can be said that the action that would best help you accomplish this is to segment the data by conversion action. This refers to separating the data based on different specific customer actions that you have categorized as valuable to your company/business. Which in this case would be a customer installing the app and a customer opening the app for the first time.