Operation Arctic Endurance, a Danish-led military exercise held in January 2026, was launched after US threats concerning:

Correct answer: Greenland. Denmark, with European allies, launched Operation Arctic Endurance in Greenland amid renewed US calls to take control of the island; Denmark officially described it as an Arctic exercise with NATO allies.

• Strait of Hormuz: The exercise was in Greenland, not the Strait of Hormuz.
• Attack on Iran: The exercise was not linked to a US attack on Iran.
• None of these: “None of these” is incorrect because Greenland is correct.