Answer:
C. It foreshadows the fatal future of their love
Step-by-step explanation:
Foreshadowing is a literary device in which the author gives us hints about what is going to happen later in the story. In literature, visions are often used as a foreshadowing tool.
In the given lines, Juliet has a vision of Romeo being dead. This truly happens at the end of the tragedy - Romeo returns to Verona, believing that Juliet is dead. When he arrives at her tomb, he sees her and concludes that his assumption was correct. Grieving, he drinks poison, which results in his death. However, it turns out that Juliet is still alive. She wakes up, finds him dead, and kills herself with his own sword. This is the fatal future of their love foreshadowed by Juliet's vision.