The correct answer is B. The trucking company did not follow the guidelines when arranging the filing .
Trucking companies that operate between Canada and the United States must comply with insurance, regulatory, and filing requirements. Cross-border trucking is not simply a matter of having ordinary automobile insurance. The company may require proper filings, evidence of financial responsibility, operating authority, cargo-related documentation, customs compliance, and other regulatory confirmations before vehicles can operate legally in the United States. If a U.S. customs agent refuses entry, the most likely reason among the options is that the trucking company did not properly arrange or follow the required filing guidelines. Option A is weak because an "international driver's licence" is not the central commercial trucking filing issue. Option C is incorrect because medical or criminal check certificates are not normally displayed on the truck for customs entry in the manner stated. Option D is technically wrong because the stated $200,000 minimum is not a reliable U.S. trucking liability requirement for this context. The broker must understand that cross-border operations require proper filings and regulatory compliance, not just a standard Canadian auto policy. Course topic reference: Automobile, Crime, and Bonds; Commercial Trucking; U.S. Filings; Cross-Border Automobile Insurance Requirements .