I ' ve got it ! I am lifting it , lifting it , almost putting it on the island , almost there , and ... . The cardboard bends AGAIN and now the entire thing falls to the floor AGAIN , but this time from a higher point in the air , so the velocity of the fall smashes it completely .

OPTIONS:
[i] None of the above choices ..
[ii] Because the cardboard was in the air ..
[iii] Because the cardboard was wet ..
[iv] Because the spine bent ..
Answer the following question: Why did the structure collapse ?
[i]