If 9 engines consume 24 metric tonnes of coal, when each is working 8 hours a day; how much coal will be required for 8 engines, each running 13 hours a day, it being given that 3 engines of the former type consume as much as 4 engines of latter type.

• A. 22 metric tonnes.
• B. 27 metric tonnes.
• C. 26 metric tonnes.
• D. 25 metric tonnes.