In a family of six members A, B, C, D, E and F: A and B are married (A is male); D is only son of C (A's brother); E is D's sister; B is daughter-in-law of F (widowed).
How is E related to C?
I. Sister
II. Daughter
III. Cousin
IV. Mother
Question: 以下哪项是正确的？
Options:
A. 仅 I, B. III 或 I, C. II 或 III, D. 非 I, E. IV 或 I
Answer: C, D