The best way to correct any new problems that arise because of a solution is to
a. address problems with a counterplan
b. deal with those issues all at once
c. ignore those problems until they are severe
d. all of the above

the asnwer is: a. Address problems with a counterplan

Counterplan refers to a set of measures that specifically designed to handle the problems that arise. Counterplan typically only work on a short term period of time. But if it's prepared along with the main/original plan, it could serve as a reliable security measures if somehow the original plan gone awry.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.

this question does't support enough resioning to answer.