(A) It announced the czar’s overthrow in Russia
(B) ** It revealed a proposed military alliance between Mexico and Germany
(C) It contained orders for German u-boats to attack British passenger ships
(D) It described Romania’s plan to abandon neutrality
EXPLANATIONS BELOW
Concept note-1: -The note revealed a plan to renew unrestricted submarine warfare and to form an alliance with Mexico and Japan if the United States declared war on Germany. The message was intercepted by the British and passed on to the United States; its publication caused outrage and contributed to the U.S. entry into World War I.