What's one of the main benefits of using ad extensions?

161) What's one of the main benefits of using ad extensions?

   A)  Extensions increase your reach by showing your ad on more advertising networks
   B)  Extensions ensure a higher clickthrough rate (CTR) because they make your ad more prominent
   C)  Extensions provide additional information to make your ads more relevant to customers

   D)  Extensions are automated so you don't have to create your ads