Final answer:
B) FMCSA Part 387
The FMCSA Part 387 regulates the financial responsibility of a carrier, outlining minimum insurance requirements and proof of financial responsibility needed for legal operation.
Step-by-step explanation:
The regulations that cover the financial responsibility of a carrier are found in the FMCSA Part 387. This part of the Federal Motor Carrier Safety Regulations (FMCSRs) specifically addresses the minimum levels of financial responsibility requirements for motor carriers, including the insurance or surety bonds that motor carriers must have in place to cover public liability, property damage, and environmental restoration. Carriers need to maintain proof of this financial responsibility and meet the specified requirements to legally operate commercial motor vehicles in interstate commerce.