In Terms of Measuring the Preferences of Constituents, the Deeper

In terms of measuring the preferences of constituents, the deeper challenge with elections is that they tend to

A) involve issues that are important to the candidates but have no relevance to the voters.
B) revolve around a small set of issues for which voters have intense preferences.
C) measure only a snapshot of public opinion at one particular point in time.
D) fail to take into account the reasons people vote in the first place.