"text": "<choice>...</choice> is the most promising since the Silhouette Scores is the highest which is <choice>...</choice>.",  
"options": [  
    "A. K=4, 0.33",  
    "B. K=8, 0.36",  
    "C. K=4, 0.36",
    "D. K=8, 0.73" 
],  
"correct_answer": "C"