When researching a problem, why would it be worthwhile to examine past solutions? a. to ensure that new solutions are unique b. to identify every potential failure that may occur c. to prove that past solutions are the best solutions d. to see how the problem has been approached before

The answer is D. to see how the problem has been approached before.

Economic success prussia had a very strong economy, partly due to the success of the zollverein. stronger prussian army king wilhelm wanted to build a bigger, stronger army but was blocked by the prussian landtag (parliament).-credits to google for putting answer -credits to slideshare for making answer-credits to me for putting answer on brain.ly