Hold on dude.
You've got a point there.
I am analyzing.
Wait, why does the extension reduce when the load is submerged? It's because of the pressure being applied in the upward direction due to the water?
Then, if the new load is longer, and is submerged, should have a lower extension?
But wait, they say it's too long to be submerged.
does that mean it is NOT submerged, or are we meant to suppose that it is, to answer? :S