A. they became more expensive because they used technology
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.
Learn more about What happened when Hungary opened its borders here:brainly.com/question/2696116
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When someone decides to change a source with invalid, incorrect, irrelevant, or just idiotic information.
* The fort was located on top of a hill and surrounded by swamps*
* Fort was far from the water, which made it difficult to reach*
*Fort was only approachable from one direction from land*
*The fort could only be attacked from the Mississippi River*