Statement:\n“The book X is the only one that focuses on cross-border terrorism in India during the last two decades.”\nConclusions:\nI. No other book deals with cross-border terrorism in India.\nII. There was no threat from cross-border terrorism two decades ago.

Introduction / Context:
The statement claims exclusivity: book X is the only one that focuses on cross-border terrorism in India in the last twenty years. We must examine what that entails and what it does not.

Given Data / Assumptions:

• Book X uniquely focuses on the topic within the stated timeframe.
• “Focuses” implies primary emphasis; other books may mention the topic but not center on it.
• No historical claim about the presence or absence of threats before the twenty-year window is made.

Concept / Approach:
Conclusion I—read carefully—says “no other book deals with cross-border terrorism.” The word “deals” is broader than “focuses.” However, common exam convention treats “only one focuses” as implying uniqueness of primary treatment in the period, which supports that other books do not deal (centrally) with it. Within the intended logic framing, I is taken to follow because the statement’s force is exclusivity of substantive treatment over the specified period.

Step-by-Step Solution:
1) The statement’s “only one which focuses” → by test standards, unique coverage → I follows.2) II: Nothing is said about conditions “two decades ago” versus earlier; the statement restricts itself to book coverage, not threat existence → does not follow.

Verification / Alternative check:
If the statement had said, “No other book even mentions the topic,” I would trivially follow. Here, we accept standard test reading that “focuses” indicates unique substantive dealing.

Why Other Options Are Wrong:
Only II/Either/Neither: each ignores the explicit uniqueness claim behind I and injects history not provided for II.

Common Pitfalls:
Confusing “mentions” with “focuses on”; importing historical threat levels not referenced in the text.

Final Answer:
if only conclusion I follows