Final answer:
The question pertains to the delinquency rates of subprime mortgages during the 2008-2009 financial crisis. The provided references indicate significant losses and difficulties in the mortgage market, pointing to a high rate of late payments. However, the exact percentage is not specified in the text.
Step-by-step explanation:
During the financial crisis of 2008-2009, the rate of subprime mortgages with late payments of at least 30 days was notably high. Due to falling housing prices post-2007 and the recession making it difficult for homeowners to meet their mortgage obligations, delinquency rates increased. When the housing bubble burst, financial institutions were forced to acknowledge that their mortgage-backed securities, once thought to be ultra-safe, were significantly at risk, contributing to the failure of 318 banks over the subsequent years. The correct answer to the question is not provided in the text, but historical data points to a significantly high percentage, likely reflecting options B) 75% or D) 50%.