Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European c【单选题】

Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.

A. emphatically stated

B. belligerently(aggressively) argued

C. accentuated(emphasize)

D. entreated 恳求 （implore, plea, invoke ）