D) they were religious centers
Least common multiple (LCM) of 10 and 20 is 20.
I am for sure it is B. economies
There are four reasons as to why. They are:
1. The invasion forced Germany to surrender.
2. The invasion ended German ambitions to invade the United States.
3. The invasion was key in forcing the Germans to retreat east.
and finally
4. The invasion exhausted German supplies and weakened their defenses.
