Question

read the passage.
april fools days around the world
april fools day is celebrated around the world, although it varies somewhat from country to country. in the united states, for example, its a day to play practical jokes. in france, where the holiday is known as poisson davril, or april fish, people secretly tape paper fish on their friends backs. a common april fools prank in portugal is to throw flour on someone; in scotland, the most popular trick involves sending someone on a useless errand. denmark celebrates april fools day on april 1, but some people there celebrate again in may. maj - kat, on may 1, is yet another day for jokes and pranks in the spring.
what is the main, or central, idea of the passage?
on poisson davril, frances version of what americans call april fools day, pranksters tape paper fish to peoples backs.
though there are variations in how different countries observe april fools day, the celebrations all involve playing pranks.

Explanation:

The passage opens by stating April Fools' Day is celebrated globally with country-to-country differences, then details unique pranks in the U.S., France, Portugal, Scotland, and Denmark. The first option only covers France's tradition, which is a supporting detail. The second option captures the overarching idea: the holiday has regional variations but centers on pranks.

Answer:

Though there are variations in how different countries observe April Fools' Day, the celebrations all involve playing pranks.