The Cold War, an apt name for the nervous post-World War II relations between the superpowers, prompted
families to build bomb shelters costing thousands of dollars but fortunately were never used.
A) families to build bomb shelters costing thousands of dollars
butB) families to invest in bomb shelters that would cost thousands of dollars
and that
C) families to invest thousands of dollars in bomb shelters
thatD)
the building by families of bomb shelters costing thousands of dollars that
E) the building of bomb shelters by families that cost thousands of dollars
butC is correct and concise
IMO C