Although Public Opinion Does Not Fluctuate Erratically, Change Can Occur

Although public opinion does not fluctuate erratically, change can occur when which of the following happens?

A) When the president makes his State of the Union address
B) When older voters change their minds collectively on an issue
C) When different generations with different experiences enter the electorate
D) When pollsters refine their questions to get the answers that they're looking for
E) When everyone maintains the same opinion about current topics