We can actually deduce here that in responding to Broderick's argument, Gibb uses counterargument.
What is counterargument?
Counterargument is actually known to be a way that an argument is countered by someone by using another argument or logic.
I couldn't find any related question to this online. But take note that when an argument is made, there is usually a counterargument which comes to counter it. Gibb's speech was a counterargument.
Learn more about counterargument on https://brainly.com/question/27246913
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