Question

(speaking of icebergs)
ships which were going westward ahead of the titanic, had both become entangled in ice and the niagaria had sustained considerable damage.
news was coming in from other ships commenting on the unusual number of icebergs which they had encountered.
which is a theme we could find in this excerpt?
the ocean seems empty when you look at it, and it actually is.
nature is beautiful and there is no need to ever worry about it.
warnings should be taken seriously when it comes to safety.

Explanation:

The excerpt mentions ships encountering ice and sustaining damage, implying a failure to heed potential safety warnings (e.g., about ice hazards). The theme of taking safety warnings seriously aligns with this context, while the other options are irrelevant: the ocean is not described as empty, nature is presented as hazardous (not just beautiful with no need to worry).

Answer:

Warnings should be taken seriously when it comes to safety.