The correct answer that would best complete the given statement above would be option B. Since, Steve and Kathy have differences in conversational styles, including their words choices and interruption and questioning patterns, this demonstrates GENDERLECT. The term "Genderlect" was coined by Deborah Tannen which means that men and women have different ways of conversing, but that does not mean that one is right or wrong, superior or inferior---they are just different.
