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What is the common factor found in the four U.S. presidents: Abraham Lincoln , James A. Garfield , William McKinley , and John F. Kennedy ?

What is the common factor found in the four U.S. presidents: Abraham Lincoln , James A. Garfield , William McKinley , and John F. Kennedy ?

A. Reformed U.S. Army
B. Had blood relation
C. Action against slavery
D. All four were assassinatedÂ