Examine the following relationships among members of a family of six persons A, B, C, D, E and F. I. The number of males equals that of females. II. A and E are sons of F. III. D is the mother of two, one boy and one girl. IV. B is the son of A. V. There is only one married couple in the family at present. Which one of the following inferences can be drawn from the above?

Here is the step by step breakdown of the family relationships: 1. Identify the males: From statement II, A and E are sons of F. From statement IV, B is the son of A. This gives us three males: A, E, and B. 2. Determine the gender balance: Statement I says there are three males and three females. Since A, E, and B are males, the females must be C, D, and F. 3. Identify the couple: Statement V says there is only one married couple. Statement III says D is the mother of a boy and a girl. Since B is the son of A, and A is a male, A and D must be the married couple. Their children are B (the boy) and C (the girl). 4. Conclusion: A is the husband of D. Therefore, Option B is the only correct inference. Options A, C, and D are incorrect because A is male, E and F are not children of D (E is A's brother and F is A's mother), and D is F's daughter in law, not grand daughter.