Plant Manager: We could greatly reduce the amount of sulfur dioxide our copper-smelting plant releases into the atmos...

lerondagates October 17, 2019

Why not D?

I see why the answer is D now, but I am unsure how to rule out answer choice D. Is it because the PM does not mention fuel efficiency? Thanks in advance

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lerondagates October 17, 2019

^^^ I mean I see why the answer is B

Victoria October 17, 2019

Hi @lerondagates,

That is correct! The plant manager does not mention fuel efficiency. Rather, their argument is focused on the cost of replacing the open furnaces with closed furnaces.

The supervisor agrees with the overall conclusion that the new process is expensive. They highlight the fuel efficiency of the new process to contest the plant manager's point that the new process costs more to run than the old. If the new process is more fuel efficient, it will require less fuel than the old process and will therefore cost less to run.

Keep up the good work and please let us know if you have any further questions.