Because the numbers of Americans who identify with the Democratic and Republican parties are closer than they have been for a long time, which of the following has become more important to candidates in recent elections?

__________ charters allow local governments to make and enforce public policy on any issue not under the mandate of a special district or explicitly prohibited by state law

Fill in the blanks with correct word

In nonexperimental research designs, which technique is usually used to establish nonspuriousness?

A. counterfactuals B. association C. statistical control D. randomization