Final answer:
It is false that concessions in a Rogerian argument should be only one or two sentences; a more detailed exploration of counterarguments is encouraged to reach a common understanding.
Step-by-step explanation:
The statement that concessions in a Rogerian argument should be only one or two sentences is false. In Rogerian arguments, it is typically more effective to consider one or two serious counterarguments in depth. This approach allows the writer to demonstrate an understanding of the opposing viewpoint and to discuss it in a respectful and thoughtful manner. By only dedicating one or two sentences to concessions, a writer risks appearing dismissive and superficial in their understanding of the counterargument. The purpose of a Rogerian argument is to reach common ground and mutual understanding, which often requires a detailed exploration of alternative views.