Asales tax is considered a tax because it tends to affect those with low incomes more than it does people with higher incomes.

A sales tax is considered a REGRESSIVE tax because it tends to affect those with low incomes more than it does people with higher incomes. There's an inverse relationship between the tax rate and the taxpayer's ability to pay. The higher income group pays less in taxes than the lower income group.

Ithink it would be choices a and b. hope this !