(C) Time of day
(D) Ad preference
You cannot use Ad preference of a customer to change your keyword bids because this data is available only to Google and they don’t share this with their Advertisers. Ad preferences are used to show relevant ads to users. You can change your keyword bids according to the location of the user, the device they are using and you can also change your bid according to the time of the day.
This question is a part of the Google Analytics Individual Qualification. You can get all the answers with detailed explanation for this exam in our Google Analytics Individual Qualification Exam Answers page.