In "Crossroads: A Sad Vaudeville," the man believes that he will recognize the voice of the woman he loves. This is before ever meeting her, and without knowing what she looks like. This shows that the man is in love with the "idea of love," not with the woman herself. It also shows that he has high expectations and will probably be disappointed, as love relationships are never as ideal as people like him believe.
The theme depicted through Juliet's monologue is B: Love is powerful.
The reason behind this is that Juliet asks Romeo if he loves her and says that if he says "yes" she will believe it but if he swears he does, he may be lying. She asks Romeo that if he really loves her, he must say it truly. This is how she explains that love is powerful.
