Answer:
D) He pursued friendly relations with the Soviet Union and China.
Step-by-step explanation:
Nixon eased political and economic tensions between the US and Soviet Union through the policy of detente. This resulted in the US and Soviet Union de-escalating the Cold War tensions through the Strategic Arms Limitation Talks (SALT I). These talks lead to the limiting of strategic military arms (like nuclear missiles) being made by the United States and Soviet Union.
Along with easing tensions with the Soviet Union, Nixon also opened up trading with China again. This still has a significant impact on the American economy today.