Final answer:
The Equal Credit Opportunity Act is the law that outlaws a creditor from rejecting a borrower based on their marital status.
Step-by-step explanation:
The law that outlaws a creditor from rejecting a borrower based on their marital status is the Equal Credit Opportunity Act. This federal law prohibits using factors such as gender, race, ethnicity, and age in making decisions regarding the extension of credit.
Under this law, lenders are no longer allowed to refuse to loan money to married women independently of their husbands or consider only the husband's income when extending credit to a family.