The correct option is C Roman times
In Roman Britain, the Romans were exploiting all major coalfields by the late 2nd century AD. While much of its use remained local, a lively trade developed along the North Sea coast. This also extended to the continental Rhineland, where bituminous coal was already used for the smelting of iron ore. After the Romans left Britain, in AD 410, there are few records of coal being used in the country until the end of the 12th century.