Question

which best describes what occurred during the détente era? arms reduction arms limitation alliance formation increased openness

Explanation:

During the détente era (1970s), the focus was on easing Cold - War tensions. Arms limitation treaties like SALT I (Strategic Arms Limitation Talks I) were a key aspect. Arms reduction was more of a later - stage goal (e.g., START treaties in the 1990s). Alliance formation was more characteristic of the early Cold - War (e.g., NATO and Warsaw Pact). Increased openness (glasnost) was a Gorbachev - era (1980s) Soviet policy.

Answer:

arms limitation