What Value Is There in Analyzing the Changeability or Continuity

What value is there in analyzing the changeability or continuity of public opinion over time?

A) Continuity supports the idea that policies should be enacted swiftly in response to public opinion.
B) Continuity allows the president to more effectively launch a campaign for reelection.
C) Continuity gives lawmakers a better idea of which policies are popular and which are unpopular.
D) Continuity helps analysts determine the impact of major political events on public opinion.