When setting up an AdWords account, choose your currency and permanent time zone carefully because:

46) When setting up an AdWords account, choose your currency and permanent time zone carefully because:

  A)  time zone and currency will impact ad position
  B)  these cannot be changed once you have set up your account
  C)  ads are only served in countries using the same currency as your account

  D)  by default, ads are only served in the same time zones as indicated in your account