Final answer:
Residual market insurance programs exist to offer coverage to high-risk individuals who are usually denied insurance in the regular market due to adverse selection.
Step-by-step explanation:
The statement that best explains why residual market insurance programs exist is to provide insurance coverage for high-risk individuals who cannot obtain it in the standard market. Due to adverse selection, insurance companies will often avoid selling insurance to high-risk individuals, as this would be financially disadvantageous for them. Residual market insurance is a solution to ensure that these individuals can still obtain insurance, even though they present a higher risk and might otherwise be unable to secure coverage.