You can add a '+' modifier in front of broad match keywords to...

You can add a '+' modifier in front of broad match keywords to...

  A)  specify that certain words must be included in someones search term to trigger your ads
  B)  indicate that this keyword should be dynamically inserted into your ad text
  C)  only trigger ads when the Google+ social extension is available
  D)  overrides negative keywords with an explicit positive keyword