Why should you link your client's AdWords account to Google's Webmaster Tools?

174) Why should you link your client's AdWords account to Google's Webmaster Tools?

   A)  See how your ads performed when triggered by actual searches
   B)  See how often your ads rank higher in search results than those of other advertisers
   C)  See if people reach your client's website via ads or organic search results

   D)  See which campaigns have the biggest changes in clicks, costs, and conversions