Khẳng định nào sau đây đúng? (căn 5 +2)^-2017<(căn 5 +2)^-2018

A. ${\left(\sqrt{5}+2\right)}^{-2017}<{\left(\sqrt{5}+2\right)}^{-2018}$

B. ${\left(\sqrt{5}+2\right)}^{2018}<{\left(\sqrt{5}+2\right)}^{2019}$

C. ${\left(\sqrt{5}-2\right)}^{2018}>{\left(\sqrt{5}-2\right)}^{2019}$

D. ${\left(\sqrt{5}-2\right)}^{2018}<{\left(\sqrt{5}-2\right)}^{2019}$