GMAT Sentence Correction (SC) | Re: By the late 1960s, the rising number

By the late 1960s, the rising number of American casualties in Vietnam and the 1968 Tet Offensive, the Viet Cong's coordinated surprise attack on American installations throughout the whole of Vietnam,suggested that Vietnam was an ultimately unwinnable situation for the United States .

A) suggested that Vietnam was an ultimately unwinnable situation for the United States - Correct
B) suggested Vietnam to be an ultimate unwinnable situation to the United States - suggested Vietnam is illogical
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