Which statement BEST describes the alliance systems in the years leading up to World War I? A) Each country in Europe was aware of the diplomatic agreements between the other countries. B) Pre-war all

Which statement BEST describes the alliance systems in the years leading up to World War I? A) Each country in Europe was aware of the diplomatic agreements between the other countries. B) Pre-war alliances were made in secret and elevated diplomatic tensions within those governments. C) International groups like the League of Nations failed in their efforts to prevent military build-ups. D) The alliances were entered into mainly for economic reasons rather than for political or military ones.