Captain Lafoot spied a merchant ship and prepared to give chase. Again the pirates were interrupted, as a giant octopus rose from the depths and fastened its powerful tentacles on the pirate ship.

Just as the ship was about to be pulled beneath the surface by the octopus, a further menace, the sea serpent, appeared. It attacked the giant octopus, which released the pirate ship, enabling it to flee to safety.

The two monsters were so large and ferocious and the experience so frightening that, of Captain Lafoot and his four mates, the hair on the heads of two of them turned white.

From the statements 1 to 6 that follow, whose hair turned white?

1. If Will Kidd’s hair turned white, then Red Beard’s hair turned white.
2. If Black Jack’s hair turned white, then Red Beard’s hair did not turn white.
3. If Long John’s hair turned white, then Captain Lafoot’s hair did not turn white.
4. Will Kidd’s hair turned white, if Captain Lafoot’s hair turned white.
5. If Red Beard’s hair turned white, then Long John’s hair did not turn white.
6. If Captain Lafoot’s hair did not turn white, then Black Jack’s hair did not turn white.