According to the passage, which of the following could we infer?
If radar had existed 40 years ago, the Titanic would have never disappeared from the world.
If the lookout had had much more experience, he could have had the time to save the Titanic.
If there had been enough lifeboats on the Titanic, the Titanic would not have sunk in the Atlantic.
If the captain had been more careful, he could have had the chance to save the Titanic.