Obi added a sitelink extension to her text ad and wants it to show as often as possible. What‟s the best way to achieve this?

Obi added a sitelink extension to her text ad and wants it to show as often as possible. What‟s the best way to achieve this?

A) Add a second type of extension
B) Lower her Ad Rank
C) Lower her maximum cost-per-click (max.CPC)
D) Raise her maximum cost-per-click (max. CPC)