Hi geet,geet wrote:@goelmohit2002
Sorry i dont have any official explanation, but B is wrong because
1)"a tripling in the average output of ironwork" here the structure of the sentence is wrong it should be " the average output of ironwork was tripled due to the"
2)"replacement of charcoal by coal for the fuel"........ here "for" should be "as the fuel" .Fuel as a whole is not replaced by something but charcoal is replaced by coal as a fuel.
i hope it helps
Yes I agree that B is no good too...
But can't figure out reasons to prefer A either too....
Probably I am missing something here....
Can you please tell the source....
