The correct answers to identify the contributions to the WWII effort of the three facilities listed are the following:
Brunswick built "Liberty Ships" to move men and supplies across the ocean. During WWI, the shipyards in Brunswick built 99 of these cargo ships.
Bell Bomber Plant built B-29, putting hundreds of the war's most advanced aircraft into service. During WWII, the Bell Aircraft Corporation built 663 Boeng-designed B-29s in their industrial center in the Sunbelt.
Military bases trained new recruits, held prisoners of war, repaired damaged aircraft, prepared thousands of soldiers for combat. These were the usual activities in military bases during war, training new soldiers and keeping the equipment ready and in good condition.