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 financial assistance for education, which led to a significant increase in the number of individuals pursuing higher education and earning degrees during that time period.