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.
                    
                
                        - 
                Asuggested that Vietnam was an ultimately unwinnable situation for the United States
                                    分析该选项
                            
 
                        - 
                Bsuggested Vietnam to be an ultimate unwinnable situation to the United States
                                    分析该选项
                            
 
                        - 
                Chad suggested that Vietnam was an ultimately unwinnable situation to the United States
                                    分析该选项
                            
 
                        - 
                Dsuggesting Vietnam to be an ultimately unwinnable situation to the United States
                                    分析该选项
                            
 
                        - 
                Esuggesting that Vietnam was an ultimate unwinnable situation for the United States
                                    分析该选项
                            
 
                    
                        显示答案
        正确答案: A