Which of the following caused the greatest fear and was a threat to peace during the Cold War? large outbreaks of polio

the race to put men into space

the invention of new computers

the build-up of nuclear weapons

The build up of nuclear weapons since that’s what the whole Cold War was mostly about. Outbreaks of polio weren’t a huge concern since they were mostly in the earlier 20th century. The race to put men on space didn’t cause fear and didn’t pose a threat, and the invention of new computers were in the late 1900’s. Therefore the buildup of nuclear weapons was the biggest threat and concern.

The answer coastal regions and peary land