Why was the army of the Western Roman Empire weakened?

A. Too much money was spent on defensive walls in the West.
B. Soldiers from the East invaded the Western Roman Empire.
C. The West focused too much on its navy when the empire split.
D. The West had problems communicating with the capital.

The answer is B

b

Explanation:

they chose sides following the death of the islamic prophet muhammad in ad 632. a dispute over succession to islamic prophet muhammad as a caliph of the islamic community spread across various parts of the world, which led to the battle of jamal and battle of siffin.

hope it