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 White Knight asks Alice to wait and wave to him.

Explanation:

The character of the White Knight in Lewis Carroll's "Through the Looking Glass" is believed to be based on the author. This is because of the way the White Knight seemed to be the only one good and helpful to Alice and also helped her move on safely.

One detail that is symbolic of the author Lewis Carroll's sadness in the fact that Alice is growing up is when the White Knight asked Alice to see him off and wave to him until he's out of sight. The White Knight had promised to help Alice become Queen and had 'escorted' her till the end of the final square. He asked her to wait and wave to him until he's no longer in sight.  This last 'interaction' is the transition of Alice from being a child to an adult, her growing up.

Thus, the correct answer is the second option.

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