How did the passengers on board the last voyage of the Lusitania know they could be in real danger if they decided to board the ship?

i think the answer is a and i hope this ; ))

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

d) in the state of iowa