Then he sat up straight and said, “we'd better start home.” not “shall i take you home? ” or “do you live far? ” but “we'd better start home.” see, that's how i knew he wanted to take me home. not because he had to but because he wanted to. the explanation expressed in this excerpt best reveals that the narrator

The explanation expressed in this excerpt reveals that the narrator HAS A NATURAL INSIGHT ABOUT WHAT THE WORDS LIKELY SUGGESTED.
From the passage given above it can be seen that the narrator has the capacity to infer and interpret spoken words in order to get their true meaning. She correctly guess in the passage, that the boy had a natural desire to take her home.