Final answer:
Juliet's concern in lines 100-111 is that their love might be based on infatuation rather than lasting love. This concern is valid considering the arranged marriages and societal consequences depicted in the play.
Step-by-step explanation:
Juliet's concern in lines 100-111 is that their love might be based on infatuation rather than a deep, lasting love. She expresses worries about the intensity of their love and the fact that they have just met. This concern is valid because during Shakespearean times, marriages were often arranged by families, and the idea of love at first sight and quick courtship was met with skepticism.
Marriages in the Elizabethan era were typically arranged for social and economic reasons, and personal feelings were not the primary focus. Juliet's concern reflects the contrast between their passionate love and the more pragmatic approach to marriage prevalent at the time.
Additionally, in the society depicted in the play, impulsiveness in romantic matters had significant consequences, such as family feuds and violence, and quick decisions in love and marriage could have far-reaching implications for the characters and their families. Juliet's concern is therefore valid as she is aware of the potential consequences of their hasty relationship.