Two mountain ranges, the Alps and the Apennines, helped to protect Rome from invasion. The Apennines divide the Italian peninsula in half and, according to SPQR Online, allowed the Romans to mass forces for counter-attack whenever they were threatened.
The correct answer is A the first one.
19: The Spanish conquered the Aztec lands.
Difficulties of moving armies, compelling local administrators to obey orders, rebellious governors, new dynasties, and periodic revolts
