Video Explanation

Text Explanation

From all the evidence given, it seems that BCC (and the independent consultants) have taken all costs into account, and the analysis reveals that they will reap a considerable profit. In order to call this into question, we have to come up with some major unanticipated cost that would not be something already considered in this analysis.

(D) is the credited answer. First of all, laser printers and photocopiers are very common devices in office spaces, so we good reason to think that many of Megalimpet's tenants will use these. If the toner degrades the carpet, that's a huge additional expense for BCC, because their contract includes "ongoing maintenance" --- i.e. replacing any carpet that needs replacing. Finally, nothing in the argument stem gives us any indication that this problem was on anybody's radar, so this well could be an unexpected or unanticipated expense for BCC. Therefore, it most calls into question the idea that BCC will make a huge profit.

(A) & (C) are all expenses that would have been very clear to BCC and to its independent consultants, and therefore all of these would have had to have been taken into account when the financial analysis of the bid was made. There is no reason any of these expenses would be unanticipated.

(B) speaks to BCC previous experience, which, if anything, would tend to suggest they know what they are talking about. If anything, this would tend to strengthen the argument, not weaken it.

(E) only compares BCC to the second lowest bid, but we have no idea about that company, what it did or did not take into account in their bid, and what their overall costs might be. There are too many unknowns for this piece of information, by itself, to have any substantial impact on the argument.