You’re working on the bidding strategy for a Search Network campaign. If the cost-per-conversion for mobile is lower than for desktop, how might you optimize the bidding strategy to increase the number of conversions?
Increase the mobile bid adjustment for the campaign
Decrease the mobile bid adjustment for the campaign
Increase the number of mobile-optimized text ads
Decrease the number of mobile-optimized text ads
Bid adjustments allow you to show your ads more or less frequently based on where, when, and how people search. For example, sometimes a click is worth more to you if it comes from a smartphone, at a certain time of day, or from a specific location.
Use mobile bid adjustments to show your ad more or less frequently for searches that occur on mobile devices
Read more here: //support.google.com/adwords/answer/2732132?hl=en