Last night was the worst night of the trip as far as the rolling of the ship . When it gets like this , things really move around -- cabinet doors that are not tightly secured fly open and the contents spill out on the floor . When we woke up there were papers on the floor that had vibrated off the desk and one of the cabinets had spilled out . The library in the lounge had disgorged all of its books which were spread from one end of the room to the other , plus the scrabble pieces were also dumped out .
Why did the the books end up on the floor ?
Pick the best answer from the following options:
- Because the bookshelf had collapsed .
 - Because the toddler threw them .
 - Because they were in the process of moving .
 - Because the ship hit rough water .


Because the ship hit rough water .