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