Final answer:
The unclear element in the Nurse's communication to Juliet is the significance of the message itself (Option E), which contributes to the dramatic and thematic complexity of 'Romeo and Juliet'. Option E) The significance of the message itself is the correct answer.
Step-by-step explanation:
The ambiguity in the Nurse's communication to Juliet in Romeo and Juliet refers to the unclear significance of the message itself (E).
Even though the characters of the Nurse and Juliet have a close relationship, where the Nurse serves as a foil and displays earthy wit, there can be moments where her messages are not direct or clear, leaving Juliet and the audience uncertain about what is being communicated.
Ambiguity can arise from the way writers, like Shakespeare, employ words to add depth to their characters and plots, leaving some interpretations open to the readers' or characters' perspectives.