An advertiser wants to increase the Quality Score of a low-perofrming keyword. Which approach would you recommend?

An advertiser wants to increase the Quality Score of a low-perofrming keyword. Which approach would you recommend?
   
A)  Repeat the keyword as many times as possible in the ad text.
B)  Delete the keyword and add the keyword to the campaign again
C)  Modify the ad associated with that keyword to direct to a highly-relevant landing page
D)  Increase the daily budget for the campaign in which the keyword is located

Answer : Modify the ad associated with that keyword to direct to a highly-relevant landing page

Reason : 

To Improve your ad quality, you know what your customers are looking for, you can modify or focus on making your campaigns, keywords, ads, and landing page more relevant to them, making customers more likely to click your ads.

Read more at https://support.google.com/adwords/answer/2404196