Total number of men, women and children working in a factory is 18. They earn Rs. 4000 in a day. If the sum of the wages of all men, all women and all children is in ratio of 18: 10: 12 and if the wages of an individual man, woman and child is in ratio 6: 5: 3, then how much a woman earn in a day?

• A. Rs. 120
• B. Rs. 150
• C. Rs. 250
• D. Rs. 400
• E. None of these