The correct answer is A. Decide how much money should be raised through real estate taxes.
A computer system is a tool that can be used to perform a variety of tasks, but it is not capable of making decisions. The decision of how much money should be raised through real estate taxes is a political one that should be made by elected officials.
The other options are all tasks that a computer system can easily do. For example, a computer system can keep records of tax rates, compute tax due for each property owner each quarter, keep records of all assessments, and record and credit tax payments received from property owners.
In conclusion, the computer system would be least able to do the task of deciding how much money should be raised through real estate taxes.