Which is the quickest way to add a long list of locations to target in an AdWords campaign?

Which is the quickest way to add a long list of locations to target in an AdWords campaign?

  A)  Select "Bulk locations" in the advanced section of a campaigns location settings
  B)  Add locations as keywords to the campaign
  C)  Search for each location in the search tab of locations settings
  D)  Enter a value in the "Show my ads within" box