What items are prohibited from being thrown into the water according to the garbage placard?

The first option correctly identifies items that are prohibited from being disposed of in the water, according to common guidelines for waste management and environmental protection. Plastic, rags, glass, food, and metal are all materials that can cause significant harm to aquatic ecosystems.

Plastic can break down into microplastics, affecting marine life. Rags and other textiles can entangle wildlife or degrade water quality. Glass poses a physical hazard to both animals and humans and can also leach harmful substances into marine environments. Food waste can lead to nutrient pollution, which contributes to harmful algal blooms. Metal can corrode and leach toxic substances, further degrading water quality.

Disposal of these items in water bodies is strictly prohibited to maintain ecological balance and prevent pollution, aligning with environmental regulations that seek to protect aquatic habitats and organisms. Each of the other options includes materials that are generally more biodegradable or less harmful in comparison, which is why they do not fall under the same stringent prohibitions.