What Do We Mean When We Speak of the "Rational

What do we mean when we speak of the "rational public"?

A) Americans' collective policy preferences react rather sensibly to events, to changing circumstances, and to new information.
B) Most people vote according to a well-established political ideology.
C) People understand that politics is irrational.
D) People vote for candidates that focus almost exclusively on "bread and butter" issues.
E) Americans tend to vote only when two parties field candidates in a political contest.