In order to achieve the best performance possible from text ads, which is a best practice that should be followed?

In order to achieve the best performance possible from text ads, which is a best practice that should be followed?

  A)  Use at least five keywords from the ad group directly in the ad text
  B)  Use account statistics and reports to monitor ad performance
  C)  Include words like "find" and "searchA" in the ad text
  D)  Include no more than one ad text per ad group