The Best Way to Determine Most Americans' Political Ideology Is

 The best way to determine most Americans' political ideology is to ask them  

A)  to self-identify as "liberal," "conservative," or "moderate." 
B)  to self-identify as "Democrat," "Republican," or "Independent." 
C)  to self-identify as "left-leaning," "right-learning," or "independent." 
D)  multiple questions about morality and personality. 
E)  multiple questions about politics and government.