The main theme of the passage is the bittersweet brevity of childish naivete, as shown in the third answer option.
We can arrive at this answer because:
Eppie is a child and this naivete and purity is something common to her age, even though she is living in an environment that tries to take it away from her at all costs.
Eppie is a character from the book "Silas Marner" and the passage to which the question refers is in the image below.
More information:
https://brainly.com/question/4420868?referrer=searchResults