The correct answer is "creation of first suburban housing developments."
The GI Bill helped in giving former veterans educational opportunities and financial assistance. In this case, many veterans used this as a means to receive a low cost mortgage. Since the government was willing to give so many of these low cost mortgages to those who served in World War II, the creation of new houses increased.
One former military man took advantage of this, his name is William Levitt. William created what became known as Levittowns, which were suburban houses built on the concept of conformity. Levitt built successful towns in the northeast part of the US where thousands of former soldiers lived.