Correct answer: A. Attempt to talk with the Eastern Bloc and reduce tension
Explanation: The direct answer is A: Attempt to talk with the Eastern Bloc and reduce tension. Willy Brandt's Ostpolitik, meaning Eastern Policy, changed West Germany's approach by seeking practical communication, agreements, and improved relations with East Germany, the Soviet Union, and other Eastern European states. This did not mean that West Germany abandoned its political differences or accepted every communist policy. Rather, it recognized that dialogue and limited cooperation could reduce Cold War hostility and make contact easier. The reasoning is: Ostpolitik means a policy toward the East; Brandt used negotiation instead of relying only on confrontation; therefore option A is correct. Option A accurately describes dialogue and détente. Option B, military invasion of Eastern Europe, is the opposite of Ostpolitik's diplomatic method. Option C, war with France, does not describe Brandt's policy and France was a Western partner. Option D, breaking all diplomatic relations, contradicts the purpose of opening communication and agreements. A useful distinction is that dialogue is not the same as complete agreement; Ostpolitik tried to manage division peacefully. Memory cue: Ostpolitik = East-facing diplomacy.