Which of the following statements from the passage is a detail that supports the idea that the monarch is “facing a number of threats to its existence”?

This answer choice describes a possible effect of climate change, which, according to the author, poses a real threat to the overall wellbeing of the species. An animal that eats a monarch probably won’t die, but it will feel sick enough to avoid other monarchs in the future is incorrect. This answer choice describes a threat to individual monarchs–not to the species as a whole.
The males die soon afterward but the females fly north, depositing eggs on milkweed plants along the way is incorrect. This answer choice describes a natural occurrence in the life cycle of the monarch. The death of the males is natural, and not a threat to the species as a whole.
Eventually, the females too will die along the journey is incorrect. This answer choice describes a natural occurrence in the life cycle of the monarch. The death of the females is natural, and not a threat to the species as a whole.