Concept:The verb "prefer" is used with "to" when expressing a choice between two actions or things.
Explanation:The correct structure is "prefer A to B".
Here, A is "singing" and B is "dancing".
So we write: "She prefers singing to dancing".
The word "than" is used with comparative adjectives like "better than", but it does not follow "prefer".
The words "besides" and "aside" are also not correct because they do not form the proper phrase with "prefer".
Therefore, the most suitable option is "to".
Answer:She prefers singing
to dancing.
(Option D)