Which of the following is an example of a public good ?
a) when the government defends the country
b) a road
c) administering education systems
d) building a library

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.

D. formation of a labor union