Which of the following events is an example of forming a more perfect union today?
a.
citizens in arizona supporting a new immigration law
b.
people in oklahoma uniting together after the oklahoma bombing occurred
c.
people in new york declaring war on terrorism after the 9/11 attacks took place
d.
americans singing patriotic songs after the 9/11 terrorist attacks took place

The answer is: Americans singing patriotic songs after the 9/11 terrorist attacks took place

After the 9/11 terrorist attack, the patriotic songs that sung by the people show a sense of solidarity toward the victim of the tragic event. They sung the songs regardless of their political affiliation because  they realize that in the end they are all citizens of the same country and those who fall for the terrorist act were their comrades.

elastic potential energy

the correct answer is a