Answer C.
Rate(6) 20k
Policies are applied to a class following this order:
1.- Policy defined on a class
2.- Policy defined in a inheritable class where the traffic would match.
In this scenario, the class /inbound/country/city/Citrix has no policy so rule 1 does not apply. The first inheritable class where the traffic will apply is /Inbound/Citrix with policy Rate(6) 20k.