单选题 阅读下面短文.请从短文后所给各题的4个选项(A、B、C、D)中选出1个最佳选项。
On board the Cendival America, a ship on her way from Havana to New York, were no fewer than 491 passengers.Most of them were miners (矿工) returning with their gold to their homeland.At the start of the voyage, the sky had been cloudless and the wind fair.Three days later, however, the ship was rolling in a storm.
Soon water poured in the engine-room and put out the fires.This left the ship helpless, with her engines stopped.In spite of all efforts, the depth of the water down below slowly increased.It became clear to all that nothing could save the ship, and that she would soon go to the sea bottom.
Just at that moment, a sdivange sight was seen on board.Some of the miners collected their gold and stored it in their belts.They hoped to take it with them wherever they were going.But others knew that the ship would sink and didn’t want to weigh themselves down with the heavy metal.So they threw it onto the floor.
Unusual courage was shown by nearly all on hoard.The captain moved about the ship encouraging all.He sometimes gave orders in attempts to save his ship, and sometimes kept silent, always determined.But all his efforts failed.
Fortunately, when all hope had gone, another ship, the Marie of Boston, appeared on the scene.The Marie had also suffered heavily in the storm, but her captain immediately arranged to move the people in boats from the Cendival America to his own ship.The huge waves made the work painfully slow, but there was no disorder: Everyone waited patiently.Finally, all passengers were saved.The rescue work was made painfully slow mainly because ______.