Which of the following defines a credit score?

A credit score is fundamentally a numerical representation of an individual's creditworthiness, quantifying the likelihood that they will repay borrowed funds. This score is generated based on various factors, including an individual's payment history, the total amount of debt they have, the length of their credit history, new credit inquiries, and the types of credit accounts they hold. Financial institutions, lenders, and creditors use this score to assess the risk associated with lending money or extending credit to an individual. It serves as a reliable and standardized way to evaluate someone’s financial responsibility, making option B the correct choice.

The other options do not accurately encapsulate the concept of a credit score. Income stability may play a role in an individual's ability to make payments but does not define creditworthiness directly. Estimating future earnings is more related to income potential than to credit behavior. Lastly, while a detailed employment history can be relevant in assessing financial responsibility, it does not provide a direct measure of someone’s creditworthiness in the way a credit score does.