• The correct answer is: খ) Became worse or declined
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Idiom: Gone to dogs 
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Bangla Meaning: কোন কিছু স্বাভাবিকের চেয়ে খারাপ হওয়া 
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English Meaning: to become ruined; to change to a much worse condition 
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Explanation: “Gone to dogs” is an idiom meaning to become ruined, spoiled, or declined in quality or condition. 
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In the sentence: It means after failing the exam, his situation or behavior got worse. 
• Other options:
ক) Improved greatly
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Opposite meaning. 
গ) Went to a park
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Literal meaning, not idiomatic. 
ঘ) Started a new hobby
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Not related. 
Sources: Merriam-Webster Dictionary, Accessible Dictionary, Live MCQ Lecture
