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The significance of credit ratings primarily lies in their role in assessing the creditworthiness of borrowers, which in turn affects interest rates and investment decisions. Credit ratings provide an opinion about the ability of a borrower—whether an individual, corporation, or government—to meet its financial obligations.

A higher credit rating indicates lower risk associated with an investment, leading to lower interest rates on borrowed funds. Conversely, a lower credit rating suggests greater risk, which often results in higher interest rates to compensate lenders for taking on that risk. Additionally, investors and financial institutions utilize credit ratings to make informed investment decisions. For example, a bond rated as investment grade may attract more investors compared to one rated as junk, influencing market dynamics and the cost of borrowing for the issuer.

Thus, option B correctly highlights the critical function that credit ratings play in the broader context of financial markets and economic activity.