Fill in the blank with a suitable adverb those given below to complete the sentence:-

Radha is a dancer, she dances very ______ on the stage.

skillfully

The correct answer is Option (4) → skillfully
So, the completed sentence is: "Radha is a dancer, she dances very skillfully on the stage."

"Skillfully" is the adverb form of "skillful," meaning that Radha dances with a high level of skill or expertise.