Pointing to Gopi, Nalni says, 'I am the daughter of the only son of his grandfather.'
How is Nalni related to Gopi?
I. Niece
II. Daughter
III. Sister
IV. Cannot be determined
Question: 以下哪项是正确的？
Options:
A. 只有 III
B. 以上各项均不成立
C. 仅 I
D. 仅 IV
Answer: A
True statement: III