Juliet's words from "Three words, dear Romeo, and good night indeed" to "And follow thee my lord throughout the world" contribute to the rising action of the play primarily through option B: They foreshadow the tragic end of Romeo and Juliet's love.
This segment reflects Juliet’s deep emotional connection to Romeo and hints at the sacrifices she is willing to make for him, which ultimately underscores the impending tragedy of their love story. Her willingness to follow Romeo "throughout the world" suggests a committed and intense love that foreshadows the lengths they will go to, as well as the eventual despair that will arise from their situations and the conflict with their families.