Choose the correct question-tag for the following sentence.
Monica isn't very tall, ______

The correct answer is Option A (Is she?).

Key Points:
• Rule 1: A negative statement takes a positive question tag.
• Rule 2: The auxiliary verb in the statement ('is') must be used in the tag.
• Rule 3: The subject noun 'Monica' is replaced by its corresponding personal pronoun 'she'.
• Given statement: 'Monica isn't very tall' (negative, auxiliary 'is').
• Correct tag: 'is she?'.
• Key Takeaway: Negative statement with 'isn't' takes the positive tag 'is she?'.