If Agnes's research proposal is approved, the fourth-floor lab must be cleaned out for her use. Immanuel's proposal, on the other hand, requires less space. So if his proposal is approved, he will continue to work in the second-floor lab. Only those proposals the director supports will be approved. So since the director will support both proposals, the fourth-floor lab must be cleaned out.

Question: The argument's reasoning is flawed because the argument
Options:
A. presumes, without providing justification, that the fourth-floor lab is bigger than the second-floor lab
B. fails to consider the possibility that a proposal will be rejected even with the director's support
C. presumes, without providing justification, that the director will support both proposals with equal enthusiasm
D. fails to consider the possibility that Immanuel will want to move to a bigger lab once his proposal is approved
E. presumes, without providing justification, that no lab other than the fourth-floor lab would be adequate for Agnes's research
Answer: "B"