1) During the Bronze Age,Outcrop coal was used in Britain,___________________________

A) where it has been detected as forming part of the composition of funeral pyres
B) whose evidence of trade in coal has been found at the inland port of Heronbridge
C) however,there is no evidence that the product was of great importance in Britain before the High Middle Ages.
D) so these easily accessible sources had largely become exhausted by the 13th century,when underground mining from shafts or adits was developed.
E) although easily-accessible surface coal from what is now the Somerset coalfield was in common use in quite lowly dwellings locally