Answer:
B) They create a sense of tragedy, by foreshadowing that Romeo's prediction will come true.
Step-by-step explanation:
In the excerpt, both Romeo and Juliet say goodbye to each other, Juliet being worried about the chance of not seeing Romeo ever again, and Romeo assuring that he will do whatever it is possible to send her his love.
But after this, Juliet makes reference to the color Romeo's skin, saying that it is pale, as if he was already dead. Romeo says that she looks as pale as him, and the reason is surely due to the sorrow of having to say goodbye. In fact, this reference to the "pale skin" is creating the atmosphere of dead, which will eventually come.