Conglomerate rocks usually form:

in deserts
in forests
on beaches
near rivers

Option B.

Explanation:

Built bomb shelters in their backyards, is the right answer.

The geopolitical tension that emerged between the United States and the Soviet Union after the Second World War is known as the Cold War. The term "Cold" for War, is used to describe a war in which no large-scale fighting took place between the two sides, however, they both supported influential territorial disputes perceived as proxy wars. It was during the course of Cold War that many people felt the fear thus they urged the Congress of the United States to built bomb shelters in their lawns.