After serving an apprenticeship in Birmingham,
Darby started a business in Bristol, but he had moved to Coalbrookdale in 1710 with an idea that coke derived from coal could provide a more economical alternative to charcoal as a fuel for ironmaking.
A. Darby started a business in Bristol, but he had moved to Coalbrookdale in 1710 with an idea that coke derived from coal could provide a more economical alternative
B. a business was started by Darby in Bristol, but then he moved to Coalbrookdale in 1710 with an idea that coke derived from coal could provide a more economical alternative
C. Darby had started a business in Bristol, but he moved to Coalbrookdale in 1710 with an idea that coke derived from coal could provide a more economic alternative
D. Darby had started a business in Bristol, but he moved to Coalbrookdale in 1710 with an idea that derivation of coke from coal could provide a more economical alternative
E. Darby had started a business in Bristol, but he moved to Coalbrookdale in 1710 with an idea that coke derived from coal could provide a more economical alternative