Final Answer:
I would need to track the button with an event and set up an event goal in order to see this information
Therefore, correct answer is b) Track the button with an event and set up an event goal.
Step-by-step explanation:
To measure the percentage of sessions during which the user clicks a "product detail" button, you would need to track the button as an event. Option (b) suggests tracking the button with an event and setting up an event goal. By doing this, you can specifically capture user interactions with the button and then set up a goal to measure the percentage of sessions where this specific event occurred.
Tracking the button as a page view (a) might not provide the necessary granularity for tracking button clicks, and setting up an event goal is not feasible with this option. Enabling the button as a KPI and setting up a dashboard (c) may not directly capture the click events or calculate the percentage of sessions with button clicks.
Setting up a "product details" button in the ecommerce JavaScript (d) is not a standard approach for tracking events in web analytics tools and may not be practical.
Therefore, correct answer is b) Track the button with an event and set up an event goal.