Which of these sentences is most important to include in a summary of this article?

Question

Sheep are social animals who prefer living in groups rather than alone.
Cameras can often be useful tools for humans trying to rescue animals.
Animals of all kinds sometimes need help that only humans can offer.
Humpback whales can get tangled up in objects left in the water.

Answer 1

Humpback whales can get tangled up in objects left in the water.