Answer:
"But perhaps most amazing about this school is that it recognizes and acts on the critical contribution that adequate food and good nutrition make to academic success."
Step-by-step explanation:
The article addresses the importance of good nutrition in students' lives, as one of the most important factors in promoting academic success. The sentence shown above is the first sentence in the article that addresses this topic, and is therefore the sentence that presents the main idea of the text.
The main idea, as you may already know, is the theme to which the article is established, showing arguments and information that prove the relevance of this theme.