A is the only make sense as assumption

the other choices do not hold any water

A) Adaption of vacant office space to meet the governments requirements, if possible, would not make leasing such space a more cost effective alternative to new construction.

B) the government prefers leasing facilities to owning them in cases where the two alternatives are equally cost effective

C) I f facilities available for leasing come very close to meeting the governments requirements for facilities the government needs, the government relax its own requirements slightly and consider those facilities in compliance.

D) the government's construction projects would not, on being completed, add to the stock of the facilities available for leasing in the cities concerned.

E) before embarking on any construction project, the government is required by law to establish beyond any reasonable doubt that there are no alternatives that are more cost effective.

for the reason in A the gov spend more money but is not guilty