Flammable solids are indicated by what kind of pattern on their placards?

Answer: C — Red and white stripes

Flammable solids are indicated by a specific color pattern that aligns with industry standards for hazard communication. The correct indication for flammable solids on placards is red and white stripes. This color scheme is utilized to convey the risk associated with flammable materials, providing immediate visual cues to emergency responders and others in the vicinity. The alternating colors help to signify the presence of a hazard that requires caution. The use of red often correlates with the fire hazard itself, whereas the white serves to enhance visibility and contrast, ensuring that the warning is easily recognizable. This system of color coding plays a crucial role in maintaining safety protocols and facilitating quick identification of potential hazards in environments where these materials are present.