A, C, and E are out.
D has passive form of speech "allowing water to be drained out of mines", and there is a lack of proper parallelism between "allowing water to be drained out of mine" and "permitting extraction of deep layer of coal"
B doesn't have passive construction, and also it has correct parallelism, even the elimination of need to use permitting twice.
D has passive form of speech "allowing water to be drained out of mines", and there is a lack of proper parallelism between "allowing water to be drained out of mine" and "permitting extraction of deep layer of coal"
B doesn't have passive construction, and also it has correct parallelism, even the elimination of need to use permitting twice.
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