When a problem is researched, authoritative sources should be used because they include thoughtful opinions.
are up to date.
are easy to find.
contain relevant information.

A or B i believe. You should define the word authoritative before picking a choice to determine which one it is. I would lean more to D

germany's government did not have enough money to pay its debts, so it began printing more money, which caused economic problems. germany did not pay off its wwi debts until 2010. germany was also responsible for paying reparations after world war ii.

explanation:

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