What have Europeans done to try to solve the problem of so many languages? Outlawed the use of languages spoken by only a few people.

Decided not to trade with people who do not speak the same language.

Made laws ensuring that English is the only official language of the European Union.

Required school children to learn one or two other languages besides their native language.

Correct answer is Required school children to learn one or two other languages besides their native language.

Explanation:

The only correct answer is the last option as on schools across Europe besides their Native language children are using additional language(s). It is usually English outside the country where English is first language and depends on geographical location.

All other options are not correct as they are depriving people from their basic human rights, which the laws of EU are not allowing.

which sentences ? that question is incomplete