Concept:The correct preposition after the verb "dabble" is "in" when it means taking part in an activity casually or superficially.
Explanation:"Dabble" means to involve yourself in an activity in a light or unserious way.
It is commonly followed by the preposition "in", as in "dabble in art" or "dabble in politics".
For example: "She dabbles in photography during her free time."
The word "dabble" does not naturally take "about", "through", or "into" in this context.
Thus, among the given options, only "in" correctly completes the sentence.
Answer:A. in