I believe the answer is going to be A but without the underlined phrase I am not 100% sure.
Write for your reader, not yourself.
Use pronouns when you can.
State your major point(s) first before going into details.
Answer:
C. In the ancient world, Rome was the center of a powerful empire.
However, it gradually lost its strength, and in 410 CE it was
invaded and practically destroyed. What factors contributed to
Rome's downfall? Why did it find itself unable to defend its own
walls?
Explanation:
The first question asks what the cause of Rome's downfall was. In the second sentence the effect is Rome was invaded and destroyed.
Answer:The Flames Of Wrath
by Ronald Wilson
Explanation: