Concept:Money is generally accepted mainly because the law declares it as legal tender for settling debts and transactions.Explanation:Money is a medium of exchange recognised by law for buying goods and services.In every country, the government gives legal backing to the official currency.This means that creditors and sellers must accept the currency to settle financial obligations.Although signatures, international acceptability, and the rule of law matter, the strongest reason is the legal backing that makes money legal tender.Answer:D. the legal backing