Three of the Following Strategies Should Foster the Development of Students

Three of the following strategies should foster the development of students' social skills.Which strategy, although possibly beneficial in other ways, will not foster more appropriate social skills?

A) Ms.Ackerman sees two students having a minor disagreement and decides to let them work it out for themselves.
B) When the school principal visits Mr.Brightman's fifth-grade class seeking volunteers to work at the school library fundraiser on Friday afternoon, Mr.Brightman says to his students, "You have always been a very thoughtful and helpful class.How many of you can spare a couple of hours after school on Friday?"
C) During an important district-wide test, Ms.Chambers reminds her students to keep their eyes on their own papers.
D) Mr.Reimer will not tolerate sexist or racist jokes in his classroom and openly tells his students so.