Answer:
Doctor Rank's admission of love prolongs the suspense because now Nora cannot ask him for help.
Explanation:
There are three characters . Two of them Nora and Helmer are already in a relationship. But Helmer is ill. And the doctor also admires Nora or maybe is willing to marry her later on. So Nora cannot ask the Doctor for help for Helmer once he expresses his love for her. Helmer and Doctor are somehow rivals.
Nora does not have any intentions of betrayal but anything can happen .
So the plot is better depicted when she cannot ask the Doctor for help after he expresses his love for Nora.
The statement best describes the way this interaction affects the plot is
Doctor Rank's admission of love prolongs the suspense because now Nora cannot ask him for help.