What is the authors method of revealing the characters in my antonia?

[Fantastic S]

In my Antonia by Willa Cather, what is the authors method of revealing:
Antonia
Lena

The choices are
-dialogue
-What characters think and say
-what other characters think and say
-Action
-Narration

Thank you! Also if you could tell me where in the story this happens, that would help a ton. Thank you so much!