A is false, some states don't have a flat tax.
Answer:
b. at a cost raising water bills so high that.
Explanation:
From the description of the sentence, it shows that the action when performed would yield the observed outcome. The cost of the project which would result to an exorbitant rise of water bills has to be questioned.
Thus the most suitable option is b, so that the correct expression would be;
The city has proposed a number of water treatment and conservation projects at a cost raising water bills so high that even environmentalists are beginning to raise alarms.
Answer:
The three question of economics are: what to produce, how to produce and for whom to produce? All of this implicate the scarcity of resources, which is what sums up all three questions. How to efficiently use what we have in order to make the biggest output possible? Inputs are limited, and businesses should use resources wisely, in a planned manner.