According to the U.S. Department of the Treasury's regulations governing sanctions programs, a financial institution must report any blocked property to the Office of Foreign Assets Control (OFAC) within 10 business days from the date the property was blocked. This requirement is stipulated in the Code of Federal Regulations (CFR). The report must provide comprehensive details about the blocked assets and the sanctioned party involved. This timely reporting is crucial for the effective administration and enforcement of U.S. sanctions programs, ensuring that OFAC has up-to-date information on assets frozen pursuant to its directives.

B. 11 business days: This is incorrect. The mandated reporting period is explicitly set at 10 business days, not 11.

C. 13 business days: This is incorrect. The regulation does not specify a 13-business-day timeframe for reporting blocked assets.

D. 14 business days: This is incorrect. While some regulatory reports have a 14-day or two-week timeline, the specific requirement for OFAC blocking reports is 10 business days.

1. U.S. Department of the Treasury. (2023). 31 C.F.R. § 501.603 - Reports on blocked and unblocked property. Code of Federal Regulations. Section: § 501.603(b)(1)(i) states, "Any U.S. person...holding property blocked pursuant to this chapter shall file a report on blocked property with OFAC within 10 business days of the property becoming blocked."

2. Association of Certified Anti-Money Laundering Specialists. (2023). Certified Global Sanctions Specialist (CGSS) Study Guide. Chapter 4: Sanctions Evasion and Violations. The guide details the operational requirements for sanctions compliance, including the 10-business-day reporting rule for blocked assets to OFAC.