You want to measure the percentage of sessions during which the user clicks a "product details" button. Which of the following would you need to do in order to see this information?

You want to measure the percentage of sessions during which the user clicks a "product details" button. Which of the following would you need to do in order to see this information?
  A)  set up a "product details" button in the commerce JavaScript
  B)  enable the button as a KPI and set up a dashboard
  C)  track the button as a page view and look at the Events Overview
  D)  track the button with an event and set up an event goal
  E)  none of these options will work