EMA

Hello John Sir,

This is an MCQ that i recently came across but its answer does not jibe well with my understanding. The answer is D, was thinking it should be B. Could you tell me why is it not B?

Environmental costs are difficult to deal with for an accountant. Which of the following is not a reason for this?
A Costs are often hidden
B Costs are mostly minor
C Costs are often very long term
D Accounting systems rarely split off these costs automatically

Thanks in advance