What happened when Hungary opened its borders is: Thousands of people left East Germany.
<h3>What happened when Hungary opened its borders?</h3>
When the border was open by Hungary or when they remove the regulation they placed on the border many people left east Germany and move to West Germany during that period.
The border opening also enables people to go to Austria to buy or purchase goods.
Therefore thousands of people left East Germany.
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"The president can make treaties, but the Senate must <span>ratify them" is the statement that shows the people having the responsibility in respect to foreign relations. The correct option among all the options that are given in the question is the first option or option "a". I hope the answer comes to your help. </span>