The statement that best explains the reason for the dramatic increase in degrees conferred between 1939 and 1950 is:
The number of degrees awarded sharply increased due to the passage of the G.I. Bill of Rights.
The G.I. Bill, officially known as the Servicemen's Readjustment Act of 1944, provided various benefits to returning World War II veterans, including funding for education. This contributed to a significant rise in the number of individuals pursuing and obtaining bachelor’s degrees during that period.