Are local initiatives more likely or less likely to be approved by voters than state initiatives?

Which of the following is a main argument for scholars who argue that the two main U.S. political parties are once again rebounding?

A.) the phenomenon of ticket splitting B.) a potential dealignment among voters C.) a lack of viable alternatives to the two-party system D.) the advent of candidate-centered campaigns

Randomization in selection and assignment can control

A) only one variable at a time. B) for threats to external validity but not for threats to internal validity. C) for many variables simultaneously. D) for threats to internal validity but not for threats to external validity.