The Dodo bird was last seen in 1660 `underline(16)` which it was never to be seen. There are different stories about the extinction of this species. Some people say that the Dutch sailors first `underline(17)` the Dodo bird and mercilessly killed it to eat its meat `underline(18)` others say that the rats and other animals `underline(19)` came on board the Dutch ships spread themselves across the island and ate up the Dodo eggs for food.

Options

A. soon
B. after
C. later
D. before