阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
These eco-inspired books get kids thinking about nature and environment.
How to Raise Monarch Butterflies
—By Carol Pasternak
Have you ever watched a monarch transform from a caterpillar （毛虫） to a butterfly from up close? In this book, learn everything about the monarch life cycle and how to raise monarchs from eggs to adult butterflies. You will also get to know the efforts involved to protect the species.
A Kid’s Guide to America’s Parks
—By Erin McHugh
This year, the US National Park Service’s National Park Week is on April 21-29. During the week, all the national parks offer free admission. Enrich your knowledge with this book, as it introduces the national parks and some interesting places in the US, including their geography, specific animals as well as environmental challenges. The book’s featured places include Yosemite National Park, Ellis Island (home of the Statue of Liberty) and the National Park of American Samoa, the only U.S. national park south of the equator（赤道）
