Critical Reasoning

The total market value of real estate in Altonville has steadily declined over the past
four years. This decline has meant that the overall figure on which the city's property
tax is based-the assessed value of that real estate-has also declined. The percentage
of assessed value that was paid as property taxes to the city, however, did not change
from year to year during this period.
The information above most strongly supports which of the following?
A. The percentage of Altonville's yearly revenue that comes from money collected
in property taxes did not change over the past four years.
B. The percentage of Altonville's yearly revenue that comes from money collected
in property taxes has declined steadily over the past four years.
C. The amount of revenue that Altonville collected from property taxes was lower
last year than it was four years ago.
D. During the past four years, Altonville officials increased tax rates on other
sources of revenue such as retail sales and business profits.
E. Altonville will soon require property owners to pay a higher percentage of the
assessed value of their property as property tax.

Stuck between A B and C...any explanations?