Which detail from Through the Looking-Glass is symbolic of the author, Lewis Carroll, being sad to see Alice Liddell grow up?

The White Knight repeatedly falls off his horse.
The White Knight asks Alice to wait and wave to him.
The White Knight tells Alice he invented a new pudding.
The White Knight leaves Alice at the end of the wood.

The detail that is symbolic of the author, Lewis Carroll, being sad to see Alice Liddell grow up is that The White Knight leaves Alice at the end of the wood.

The detail from "Through the Looking-Glass" that is symbolic of the author, Lewis Carroll, being sad to see Alice Liddell grow up is when the White Knight asks Alice to wait and wave to him. This request represents Carroll's desire to hold onto the innocence and companionship he had with Alice as she matures and ventures into adulthood.

To determine which detail from Through the Looking-Glass is symbolic of Lewis Carroll being sad to see Alice Liddell grow up, we can analyze the choices provided.

The White Knight repeatedly falling off his horse may not directly connect to Carroll's emotions about Alice growing up. It could simply be a quirky or comical characteristic of the character.

The White Knight asking Alice to wait and wave to him also may not necessarily represent Carroll's sadness about Alice's maturation. It could be seen as a friendly gesture or a way for the White Knight to maintain a connection with Alice.

The White Knight telling Alice he invented a new pudding could potentially be seen as a metaphor for Carroll trying to hold onto his connection with Alice by offering something new and exciting. However, without further context or evidence, it is difficult to conclude that this detail specifically represents sorrow over Alice growing up.

On the other hand, the detail of the White Knight leaving Alice at the end of the wood seems more closely tied to the idea of Carroll being sad to see Alice grow up. This scene could symbolize a separation or farewell, which could mirror Carroll's own feelings of loss as Alice entered adulthood.

In summary, based on the options provided, the detail of the White Knight leaving Alice at the end of the wood appears to be the most symbolic representation of Lewis Carroll being sad to see Alice Liddell grow up.