The correct option is C 4
From figures (i), (ii) and (iii), we conclude that 3,4,2 and 6 lie adjacent to 5. Therefore, 1 must lie opposite 5.
From figures (i), (iii) and (iv), we conclude that 4,5,6 and 1 lie adjacent to 3. Therefore, 2 must lie opposite 3. Now, we have 1 opposite 5 and 2 opposite 3. Hence, 4 must lie opposite 6.