Final answer:
Mary Jackson was the first African American woman to become an engineer at the NACA.
Step-by-step explanation:
The first African American woman to become an engineer at the NACA was Mary Jackson. While the options A) Mae Jemison and B) Katherine Johnson were both accomplished African American women in STEM fields, Jackson became the first African American woman to work as an engineer at the National Advisory Committee for Aeronautics (NACA), which later became NASA. Jackson joined NACA in 1951 as a research mathematician and worked her way up to engineer, contributing significant work to the field of aerospace engineering.
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