Gerund as it functions as a subject of your sentence as well.
        
                    
             
        
        
        
Answer:
B
Explanation:
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Answer:
Though he is not satisfied with his life and happy with it still he believe he would have done more with his life if he had realize earlier or known earlier 
Explanation:Now it seems he has no chance in life again because it to late to change his fate or destiny.