Which if the following, if true, most logically completes the argument?

Aroca County's public schools are supported primarily by taxes on property. The county plans to eliminate the property tax and support schools with a new three percent sales tax on all retail items sold in the county. Three percent of current retail sales is less than the amount collected through property taxes, but implementation of the plan would not necessarily reduce the amount of money going to Aroca County public schools, because ______.

• Amany Aroca County residents have already left the county because of its high property taxes  
• Ba shopping mall likely to draw shoppers from neighboring counties is about to open in Aroca County  
• Cat least some Aroca County parents are likely to use the money they will save on property taxes to send their children to private schools not funded by the county  
• Da significant proportion of parents of Aroca County public school students do not own their homes and consequently do not pay property taxes  
• Eretailers in Aroca County are not likely to absorb the sales tax by reducing the pretax price of their goods