Question

theme
which is a theme we could find in this excerpt?
warnings should be taken seriously when it comes to safety.
nature is beautiful and there is no need to ever worry about it.
the ocean seems empty when you look at it, and it actually is.
speaking of icebergs!
ships which were going westward ahead of the titanic, had both become
entangled in ice, and the nicaragua had sustained considerable damage.
news was coming in from other ships commenting on the unusual... number
of icebergs which they had encountered.
no doubt many of the passengers on the titanic were hoping that they would
meet with none.

Explanation:

The excerpt is related to ships (like Titanic) and icebergs, with warnings about safety. The first option "Warnings should be taken seriously when it comes to safety" makes sense as the other options are illogical (nature can be dangerous, ocean isn't actually empty).

Answer:

A. Warnings should be taken seriously when it comes to safety