1. The problem asks to justify the answer labeled as "iii". 2. To provide a justification, we need to understand the context or the specific problem where answer iii was given. 3. Typically, justification involves explaining the reasoning, formulas, or steps that lead to that answer. 4. Since the user did not provide the original problem or the answer iii, I cannot directly justify it. 5. Please provide the original problem or the answer iii details so I can explain the reasoning clearly.