A sitting Speaker of the House, as well as any sitting Senator from west of the Mississippi, has never been elected to the US Presidency, although three sitting eastern Senators have been elected to the office.
                    
                
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                AA sitting Speaker of the House, as well as any sitting Senator from west of the Mississippi, has never
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                BA sitting Speaker of the House, as well as any sitting Senator from west of the Mississippi, never have
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                CNo sitting Speaker of the House, as well as any sitting Senator from west of the Mississippi, has not
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                DNo sitting Speaker of the House or no sitting Senator from west of the Mississippi have ever
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                ENeither any sitting Speaker of the House nor any sitting Senator from west of the Mississippi, have ever
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        正确答案: A