Why Is the Analogy of Ping-Pong Balls Relevant to the Textbook's

Why is the analogy of ping-pong balls relevant to the textbook's discussion of public opinion formation?

A) because people often do not have one solid opinion about particular issues
B) because the mix of ideas in people's heads is often an all-or-nothing proposition
C) because people have no substantive thoughts on issues
D) because people grow more conservative as they age
E) because people grow more secure in their opinions as they age