In this question based on environmental conservation and international reports, you must recall how many Indian natural sites were mentioned in the World Wide Fund for Nature report titled "Not For Sale", which discusses threats to World Heritage sites from illegal trade and other pressures.

Introduction / Context:
The World Wide Fund for Nature, often abbreviated as WWF, publishes reports highlighting threats to biodiversity and protected areas. One such report, titled "Not For Sale", drew attention to how UNESCO World Heritage sites are being affected by illegal wildlife trade and other unsustainable activities. Many competitive exams test whether candidates remember numerical facts from these reports, such as how many Indian sites are listed as being at risk.

Given Data / Assumptions:
The report title is "Not For Sale".
The report is connected with WWF and focuses on threatened World Heritage sites.
The options for the number of Indian sites mentioned are 5, 7, 6, and 8.
We assume that the question refers to the most commonly cited figure in standard exam oriented GK books and current affairs notes.

Concept / Approach:
This is a fact based question, not a conceptual one. To answer it, you must either recall seeing the specific number in a current affairs compilation or link it with a memory trick. When reading such reports for exam preparation, it is good practice to note how many Indian sites are affected, the examples of those sites, and the nature of threats. For "Not For Sale", the widely quoted figure for Indian sites is 5.

Step-by-Step Solution:
Step 1: Remember that "Not For Sale" is a report about the impact of illegal wildlife trade and related pressure on World Heritage sites. Step 2: Recall that India has multiple natural World Heritage sites such as Kaziranga, Manas, Sundarbans, and others which often appear in such lists. Step 3: Think back to current affairs notes where a specific number of Indian sites from this report is highlighted for examination purposes. Step 4: Among the options 5, 7, 6, and 8, recall that the repeatedly quoted figure is 5 Indian sites. Step 5: Select 5 as the correct numerical answer.

Verification / Alternative check:
Current affairs booklets and exam solution discussions that cover environment and ecology often summarise international reports. For "Not For Sale", they typically specify that a small but significant number of Indian World Heritage sites, counted as 5, are mentioned as threatened by illegal trade and other harmful practices. While the exact site names vary in different summaries, the repeated number gives you a reliable basis for your answer in the exam setting.

Why Other Options Are Wrong:
7: This would imply a larger share of Indian World Heritage sites are listed than is actually stated in standard exam notes for this report.
6: This lies between 5 and 7 and can trap guesswork, but it does not match the specific figure usually printed in reference material.
8: This is an even larger number and does not correspond to the commonly accepted count of Indian sites discussed under this particular report.

Common Pitfalls:
The main difficulty with such questions is simple confusion of numbers when reading many reports and statistics at once. Candidates sometimes mix numbers from different documents, such as those about the total count of World Heritage sites in India or the number of sites in danger globally. The only sure way to handle number based questions is to prepare short summary tables that link each report with its key figures and revise them multiple times before the exam.

Final Answer:
The report "Not For Sale" mentions 5 Indian sites.