Answer:
C. Children know much that grown-ups have long forgotten
• Propaganda is used to control the citizens of society. Information, independent thought, and freedom are restricted. A figurehead or concept is worshipped by the citizens of the society. Citizens are perceived to be under constant surveillance.
In this sentence the comma is being used as an appositive. This is because the phrase "an old junk heap" renames or redefines what the "car" is.
