Central idea is the the main message of an excerpt. It is the controlling idea of the excerpt. Hence, optionC.Typical North Americans greet each other with a handshake is the answer.
<h3>What is a theme?</h3>
The theme of a passage is the central idea of the passage. It is the controlling idea of the passage.
Therefore, the controlling idea of the passage is option C.Typical North Americans greet each other with a handshake.
