The most reasonable inference to draw about Anne's personality from the details in this speech is:
C. She is resourceful because she finds outside interests that take her mind off having to live in fear of the Nazis.
In this excerpt, Anne demonstrates her ability to find interest and beauty in the world outside her confined circumstances. By observing the family on the houseboat and noting the baby learning to walk, she engages with a sense of curiosity and care that helps distract her from the oppressive reality of her situation. This suggests that she is resourceful and resilient, seeking moments of normalcy despite the dire circumstances surrounding her.