Which sentence best describes the influence of alliances on the start of World War I?
A
Alliances prevented many European countries from joining the war because they had signed a pledge not to.B
Alliances delayed the beginning of World War I because nations were afraid to attack one another.C
Alliances forced member nations to settle their differences through talks rather than through armed attacks.D
Alliances between nearly all European nations meant that when two went to war, all became involved.