Great Britain Pioneered the Use of More Efficient Technology for Coal

Great Britain pioneered the use of more efficient technology for coal and iron extraction because

A) as a dominant power its military need for weapons was greater.
B) it had exhausted its forests as a source of fuel.
C) it imported large amounts of these resources from its colonies.
D) it was able to imitate key discoveries of continental inventors.
E) All these answers are correct.