How did Leonid Brezhnev demonstrate his use of the Brezhnev Doctrine? O by signing the SALT treaties
O by abandoning the space race
O by curbing military spending
O by sending Soviet troops to Afghanistan

Correct answer is by sending Soviet troops to Afghanistan.

Explanation:

Brezhnev doctrine was focused on the reaction of Soviet troops in the areas where the Socialism was endangered.

That is why the last option is correct as Soviets reacted with military assistance in Afghanistan.

All other options are not correct as they are showing the readiness of Soviet Union to lower the tension in certain period of crisis.

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polticians and sentates thought to annoucne the fialre of articles of confedartion by making a centralized nation as a hole