Buses transporting children on field trips:
Correct. School buses have stricter rules including the S endorsement. A motorcoach used for a field trip follows the standard P rules.
CDL Practice Question #445
Category: Passenger
Why this question matters
This question is one of 58 in our Passenger bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.