The question is testing the correct usage of prepositions to complete the sentence: "He was very much ashamed ...... his mischief." The correct preposition needs to be chosen to fit naturally and accurately in the blank.
Conclusion: The correct answer is the second option, "of". Therefore, the completed sentence is: "He was very much ashamed of his mischief."
Poetic Devices: Identify the poetic device used in the following line: "The wind whispered through the trees."