Read these sentences from Paragraph 9 of the passage. But I also learned that they were vulnerable. It was not only the tourists on the beaches that were threatening the survival of the sea turtles. The turtles were getting caught in the nets dropped by fishing boats. Another major threat was the bright lights of the waterfront.

What does the word vulnerable mean in this paragraph?

targeted by predators
weak in all aspects
clumsy and unfortunate
subject to danger