A. tripled, the higher cost had brought –
a run onB tripled because the higher cost brought -
no cause and effect involved; even so tripling was not the effect of the inefficiency; it must be otherwise.
C. tripled with the higher cost bringing --
-1. 'With' denotes a physical accompaniment.
2. Looks as if tripling were the effect of the inefficiency of internal combustion D. tripled, the higher cost brought ----
a run on E. tripled and the higher cost brought --
correct choice with proper conjunction
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