According to Figure 4.1 of the AAMVA CDL Manual, which hazard class includes materials such as ammonium nitrate and hydrogen peroxide?

AAMVA CDL Manual Section 4.2.1, Figure 4.1, p. 4-2

Oxidizers like ammonium nitrate can intensify a fire dramatically if mishandled, so recognizing the Class 5 label matters for how a driver assesses risk around cargo or an unlabeled rider item. The exam checks that applicants can match a class number to its real-world materials, not just memorize the number in isolation.