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Heix
I did not quite understand the solution. can you elaborate why option c is wrong and option d is the best choice


Thank you for the question. You are correct to question it. It looks like both C and D could be the correct answer.
I am going to deactivate this question and remove from the database as it seems a bit round-about and requires some other assumptions such as that after-market parts are going to drive more profit (we don't know that) and that R&D is a significant cost element of a diesel engine - we do not know that either. Overall unfortunately this was not our best question and it is now out.

Thank you for your help. I have added 2 weeks of GMAT Club tests to your account.
-BB
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