Question

How do the sirens kill people?

Sailors become transfixed by them and wreck their ships on the rocks.
The songs actually kill the sailors.
Sailors are unable to stop listening, never do anything else, and waste away.
They attack the distracted sailors.

Answer 1

The sirens kill people in this manner - sailors become transfixed by them and wreck their ships on the rocks. 

Answer 2

The answer is The sailors become transfixed by them and wreck their ships on the rocks.