**Core Concept**
The underlying principle being tested is the proper disposal of pharmaceutical waste, specifically discarded tablets, to prevent environmental contamination and ensure public safety. This involves knowledge of **pharmaceutical waste management** and **environmental protection**.

**Why the Correct Answer is Right**
Although the exact correct answer choice is not provided, typically, discarded tablets are disposed of in a **secure landfill** or through a process that renders them unusable, such as incineration, to prevent abuse and environmental harm. This method is chosen based on the type of waste and local regulations regarding **hazardous waste disposal**.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it is not a standard method for disposing of discarded tablets.
**Option B:** Similarly, this option does not align with recommended practices for pharmaceutical waste disposal.
**Option C:** This choice is also incorrect as it does not represent an appropriate or safe method for disposing of pharmaceuticals.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that pharmaceutical waste, including discarded tablets, must be disposed of in accordance with local and national regulations to prevent **environmental pollution** and **drug abuse**.

**Correct Answer:** D. Yellow bag