Today we take it for granted that the mail will be delivered daily at our door. But many years ago it might have beenplaced in a tree trunk or underneath a rock. In the early days of the mail no one could be sure about where – or whenit would arrive. At the southern tip of Africa there was once a post office under a rock. In the old days the route fromEngland to India was around the Cape of Good Hope. The journey was stormy and dangerous. It took six longmonths. Sailors often wished to send mails home, but they seldom met ships bound back to England. So at the capethe sailors would go ashore. They headed for a certain large stone. On the stone were scratched the words “Lookhereunder for letters.” They would leave their letters there, knowing that the next homeward-bound ship world stopand pick them up.
39.The instruction “Look hereunder for letters” was directed to sailors going            .
(A)to England
(B)to India
(C)in either direction
(D)overseas