The correct answer is B) extra money due to holding down military costs.
The strategic advantage might a country gain from following a policy of Detente is that extra money due to holding down military costs.
Detente stems from a French word that means "release of tensions." It is the name to identify the friendly relationships between the United States and the Soviet Union during the Cold War years. It started when US President Richard Nixon traveled to Moscow in 1971 to visit Soviet leader Leonid I. Brezhnev. So one strategic advantage might a country gain from following a policy of Detente is that extra money due to holding down military costs because both countries save money when signed the SALT treaties, the Strategic Arms Limitation Treaty.