assessment\nat what interval should buses undergo a complete safety inspection by a certified…

Brief Explanations:

Buses are public - transit vehicles carrying many passengers. To ensure safety, they typically require regular but not overly frequent inspections. Daily inspections are too often for a complete safety check by a certified professional. Weekly is also quite frequent. Annually may be too long an interval for safety - critical vehicles. Monthly is a reasonable balance for a complete safety inspection by a certified professional to catch potential issues in a timely manner.

Answer:

C. Monthly