whats the author's main point in paragraph 1 in the text "What it took to be a NASA computer by Melinda Baldwin"

A.The author introduces the first five female human computers who began at NACA in 1935.
B.The author gives background information about how and why human computers were needed at NACA.
C.The author states a claim about how human computers were necessary for engineering design in 1935.
D.The author identifies the problem of computation in the 1930s and offer a solution in the form of female computers.