Kelly has created two ad groups for her realty business in Ohio. In both ad groups, she's identified the keyword 'Columb

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Kelly has created two ad groups for her realty business in Ohio. In both ad groups, she's identified the keyword 'Columbus Condos' for her ads. What problem exists within this scenario that could affect Kelly's ads?

A. Kelly should not have keywords competing against one another.
B. Kelly should merge all the ads into one campaign so that her ads will show up twice in search results.
C. By having two ad groups with the same keyword, Kelly may pay considerably more for her ads because the ads will appear twice in search results.
D. Kelly should only have one ad group, not multiple groups.