Denmark — World Flags

The story behind the answer

Denmark is correct because the off-center Nordic cross identifies a Scandinavian flag; Denmark’s version is the simple red field with a white cross. The other options don’t match: Belgium is a black–yellow–red vertical tricolor, and Moldova and Slovenia are tricolors with coats of arms.

Called the Dannebrog, it’s often cited as the world’s oldest continuously used national flag, linked to a 1219 legend that it fell from the sky at the Battle of Lyndanisse. Its cross inspired the flags of Sweden, Norway, Finland, and Iceland. Memory tip: Denmark = the original, pure red Nordic cross—the template for the rest.