Which of the following diagrams correctly represents European countries, Arab countries and the countries that took part in the Gulf War?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) →

In a Venn diagram, circles that overlap share some members and circles that stay apart share none. The three groups are related as follows:
European and Arab countries — no country is both, so these two circles must stay separate
Gulf War countries and European countries — some European countries (the UK, France) fought in the Gulf War of 1990–91 and many did not, so the circles overlap
Gulf War countries and Arab countries — some Arab countries (Iraq, Kuwait, Saudi Arabia, Egypt) took part and others did not, so these circles overlap too
Countries such as the USA, which is neither European nor Arab, also took part, so the Gulf War circle has a part of its own. Only Option (1) shows two separate circles, each cut by the third.

Why the other options are incorrect
Option (2) — Incorrect. All three circles overlap, which would make some countries both European and Arab.
Option (3) — Incorrect. Two overlapping circles inside a third would put every European and every Arab country in the Gulf War, and some countries in both groups.
Option (4) — Incorrect. Three separate circles would mean no European or Arab country took part in the Gulf War.