Which of the following items is NOT permitted to be thrown into the water as per the garbage placard?

The correct answer identifies glass as the item that is not permitted to be thrown into the water according to the guidelines outlined in the garbage placard. This regulation reflects environmental concerns, specifically the harmful impact that glass can have on aquatic ecosystems. Glass does not decompose like organic materials and can pose significant risks to marine life, such as injury from sharp edges and ingestion.

In contrast, items like paper waste, food scraps, and wood are often biodegradable or have different disposal guidelines that allow for their presence in water under controlled conditions, provided they do not contribute to pollution or harm the environment. It's crucial for boaters to understand and comply with these regulations to preserve water quality and the health of ecosystems.