Answer:
d. Poland.
Step-by-step explanation:
d. Poland.
On September 1, 1939, Germany invaded Poland, which marked the beginning of World War II. This was two days after Germany had issued an ultimatum to Poland, demanding that they accept German demands or face military action. Poland refused, and Germany responded by invading. This invasion of Poland was the spark that ignited the war, leading to the involvement of many other countries, including France, Czechoslovakia, and Albania.