In 13th century Hungary, the Mongal invasions caused..

AAttacks from the Ottoman Turks
BWidespread destruction
Ca strong Hungarian monarchy
Dthe spread of Roman Catholicism

Verified Answer :

I would say that the best answer here is B. A widespread destruction.

Perhaps another consequence is a change in building habits in Hungary: the castles after the invasion were made more sturdy

Ps. The Ottomans came only around 16th century