The correct answer is B) Kirtland’s role was to develop new aircraft to carry an atomic bomb and to determine ballistic characteristics for future weapons.
Kirtland Field was used as a transportation center for the scientists and for the atomic bombs developed in Los Alamos. The bomb was big and the scientists noted that Kirtland Field was a large airport with a bomb loading pit that supported the atomic bomb.
They developed the “Silverplane aircraft” to carry the bombs and also created a new loading pit adapted to future weapons.