Which of the following statements most closely describes the variation in unemployment rates across countries in Europe?

A、Countrieswithhigherratesofunionizationtendtohavehigherunemploymentrates,butthisispartiallymitigatedifwagenegotiationsarecoordinatedamongemployers.
B、Countrieswithhigherratesofunionizationtendtohavehigherunemploymentrates,andthistendencyisexacerbatedifwagenegotiationsarecoordinatedamongemployers.
C、Countrieswithmoregenerousunemploymentinsurancebenefitstendtohavehigherunemploymentrates,butthisispartiallymitigatedifthebenefitsareofferedforalongerperiodoftime.
D、Countrieswithmoregenerousunemploymentinsurancetendtohavelowerunemploymentrates,butthiseffectiscompletelyoffsetifbenefitsareofferedforalongerperiodoftime.