The correct answer is: Option A. Adopt the horses.
Given the context in the excerpt stating the individuals that would be "taking possession of the new horses" are official U.S. Marines, it can be inferred that this practice will take place within legal bounds, and therefore "stealing the horses" is out of context in this case. The intent of this activity is to use the horses as part of the Marines' activities, and as such, it is clear the Marines are planning to "adopt" the horses, not "borrow" them.
1. Changes in ocean temperatures and currents brought about by climate change will lead to alterations in climate patterns around the world. Changes in water temperature can affect the environments where fish, shellfish, and other marine species live. As climate change causes the oceans to become warmer year-round, populations of some species may adapt by shifting toward cooler areas oceans are becoming more acidic.
2. If we don’t fix it there’ll be more storms. When water is warmer, it evaporates at a faster rate which means the ocean will be able to cause even more powerful storms. This is obviously made worse by the rising sea levels.
The figure of speech is a simile.