Drag and drop words and phrases to complete the sentences

During the _____, Roman generals warred over succession. These conflicts drew soldiers away from the frontier and made the empire vulnerable to _____
Options:
Imperial crisis
Inflation
Invasion
Pax Romana
Great schism
Trade

During the Imperial crisis, Roman generals warred over succession. These conflicts drew soldiers away from the frontier and made the empire vulnerable to invasion.

During the Imperial crisis, Roman generals warred over succession. These conflicts drew soldiers away from the frontier and made the empire vulnerable to Invasion.

During the Imperial crisis, Roman generals warred over succession. These conflicts drew soldiers away from the frontier and made the empire vulnerable to invasion.