Which of the following statements best explains why more than half of all Europeans are bilingual?

A.
European laws require people to be bilingual.
B.
Europeans must speak English in addition to their native language to find work.
C.
Bordering European countries share close economic and cultural ties.
D.
Most European children come from families of mixed ethnicity.

Please select the best answer from the choices provided.

C.

Bordering European countries share close economic and cultural ties.