Next time be more specific of what you need help with
        
             
        
        
        
The correct answer is: 
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[A]:  "a gerund phrase as the object of a preposition" .
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Note:  This phrase is:  "in serving others" .
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The gerund is:  "serving" .
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The preposition is:  "in" .
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Reason, research, resonance, redescription, rewards, real-world events, and resistance. Hope this helped! :D