Mary has a Google AdWords account, and she feels that her Google AdWords aren't performing well. Mary wants to make adju

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Mary has a Google AdWords account, and she feels that her Google AdWords aren't performing well.
Mary wants to make adjustments to her ad, to get more clickthroughs to her website. Which of the following optimizations is likely to help Mary increase her clickthrough rate?

A. Mary should stop using an image ad and use a text ad only, in Google search.
B. Mary should focus on her website by adding content.
C. Mary should focus on ad quality and use negative keywords, to eliminate extra impressions.
D. Mary should create multiple campaigns, and track the performance of each campaign.