Correct Answer - Option 2 : B
Six people A, B, C, D, E and F participated in the debate.
i) Two of the six were women.
ii) E and his unmarried sister were the new members in this year's debate, D's husband who was the winner of the previous year and participating in this year's debate.
iii) A and C were last year's runners-up, this year's winner is neither previous year's winner, nor new member
iv) B has left the debate midway due to unavoidable reason
v) C at the end of the debate got more marks than A but less than E and F.
F > E > C > A
From the option, E is the new member.
'A' and 'C' were the runners-up of the previous year, Hence cannot be the husband of D as husband of 'D' was the winner of previous year.
Thus 'B' is the husband of 'D'.
Hence, the correct answer is "B".