A can complete a niece of work in 36 day, 'B in 54 days and C in 72 days. All the three began the work together but A left 8 days before the completion of the work and B, 12 days before the completion of the work. Only C worked upto the end. In how many days was the work completed ?

• A. 24
• B. 25
• C. 27
• D. 30