Answer:
The central idea of lines 16-30 is that Aunt Agatha canít contact Gussie to get him to change his embarrassing behavior.
Step-by-step explanation:
In the short story "Extricating Young Gussie" by P. G. Wodehouse. Aunt Agatha wants her nephews to marry a woman that she considers worthy of becoming part of the family, she wants Gussie to stop a relationship he has since she is not right wife material according to Aunt Agatha's mind but can not get in communication with him and that's why she asks Bertie to go and pursued Gussie.