I believe the answer is A.
I cannot do this entire thing for you, but I can help.
A cause is the thing that forces something else to happen. So, that could be anything. The effect is what comes after the event.
For example, the driver was texting while driving. That is the cause. He hit a girl. That is the event. He girl was injured. That is the effect.
Hope that helps!
The four main Allies in World War I were "England, France, the United States and Russia, although it should be noted that Italy was also an important ally, although it is not listed.
