Which of the following items IS permitted to be carried on a bus, according to the AAMVA CDL Manual?

AAMVA CDL Manual, Section 4.2.2, p. 4-2

Most hazardous materials are completely banned from buses because a leak or explosion in a vehicle full of people has nowhere to go. Knowing the narrow, specific exceptions, like ammunition and medical supplies, keeps a driver from unknowingly accepting cargo that could endanger every rider aboard.