Question

some quino checkerspots had already beaten them to it! the scientists found that a number of quino checkerspots had started making their own way around buildings and over long distances to cooler, less - developed mountainous areas. the females laid their eggs on the leaves of a new host plant they had never used before. when the caterpillars hatched, they successfully fed on the new plants leaves. quino checkerspots survived and increased their numbers in their new home.
the quino checkerspot butterfly is still an endangered species. however, with the help of conservationists - and through the butterflies own efforts to adapt - these colorful heralds of spring will have a good chance of surviving and thriving.
what is the text mainly about?
it is about how the quino checkerspot butterfly has relocated to warmer climates where plantains are more plentiful.
it is about the endangered quino checkerspot butterfly and how it is returning from the brink of extinction.
it is about how the quino checkerspot caterpillars unique shape and behavior helps it escape predators.
it is about the quino checkerspot butterflys migration routes and how they have been blocked by tall city buildings.

Explanation:

1. Analyze the first option: The text says the butterflies moved to "cooler" areas, not "warmer" and there's no mention of plantains being more plentiful, so this is incorrect.
2. Analyze the second option: The text states the Quino checkerspot is endangered, and it describes how the butterflies adapted (moved to new areas, used new host plants) and with conservationists' help, they have a chance to survive/thrive, which matches "returning from the brink of extinction".
3. Analyze the third option: The text has no information about the caterpillar's shape or escaping predators, so this is incorrect.
4. Analyze the fourth option: The text says the butterflies made their way around buildings, not that migration routes were blocked by buildings, so this is incorrect.

Answer:

B. It is about the endangered Quino checkerspot butterfly and how it is returning from the brink of extinction.