Countries that also took part in World War I for varying amounts of time included which of the following?

(A) Poland, Denmark, and Great Britain (B) Switzerland, Greece, and Turkey (C) Bulgaria, Italy, and the United States (D) Great Britain, Spain, and FranceExplanation: Bulgaria, Italy, and the United States were all engaged in World War I. Denmark (A), Switzerland (B), and Spain (D) were all neutral, although Switzerland did declare a “state of siege.”