The recent decline in land prices has hurt

问题：

The recent decline in land prices has hurt many institutions that had invested heavily in real estate. Last year, before the decline began, a local college added 2,000 acres to its holdings. The college, however, did not purchase the land but received it as a gift. Therefore the price decline will probably not affect the college.
Which of the following, if true, casts most doubt on the conclusion above

A．The 2,000 acres that the college was given last year are located within the same community as the college itself.

B．The college usually receives more contributions of money than of real estate.

C．Land prices in the region in which the college is located are currently higher than the national average.

D．Last year, the amount that the college allocated to pay for renovations included money it expected to receive by selling some of its land this year.

E．(E) Last year, the college paid no property taxes on land occupied by college buildings but instead paid fees to compensate the local government for services provided.