18 men can complete a piece of work in 63 days. 9 women take 189 days to complete the same piece of work. How many days will 4 men, 9 women and 12 children together take to complete the piece of work if 7 children alone can complete the piece of work in 486 days ?

• A. 4 days
• B. 3 days
• C. 6 days
• D. 1 days
• E. one of these