Which sentence is clear, correct and concise?

Question 4 options:

1)	The ship builders had to replace the old wooden decks with new decks that were decaying.

2)	With new decks, the old wooden decks that were decaying were replaced by the contractors.

3)	The contractors had to replace the old wooden decks with new ones.

4)	The wooden decks were decaying, the ship builders had to replace them with new ones.