Question

The United States entered World War I because __________.
a.
of German aggressions against British ships and the Zimmermann Telegram
b.
Pancho Villa invaded American soil with thousands of militia
c.
during the Lincoln County War, the United States lost a portion of New Mexico that it needed to regain to expand the railroad
d.
so many young men had enlisted and propaganda had convinced every American household that war was a necessity

Answer 1

I strongly think it is A but D could also be right

Answer 2

thanks @samstopp