Central ideas are always complete statements. Anxiety is not a complete statement therefore it is not an example of a central idea.
One thing interesting about the setting in the short story "Through the Tunnel" is that author Doris Lessing carefully uses word choices to show the striking contrast between the beach and the enticing rocky bay, and the contrast helps set the mood of the story and develop the major theme.
B) people with other religious beliefs were welcomed by colony leaders but shunned by everyone else.
