Please helpp! The women started out by simply transporting airplanes. Later they became test pilots.
They also became flight instructors.

What is the best way to combine these three sentences?
А Although the women started out by simply transporting airplanes, they later
became test pilots and flight instructors.
B The women started out by simply transporting airplanes; later they became test
pilots, and they became flight instructors.
С The women started out by simply transporting airplanes, but later they became
test pilots and became flight instructors.
D Although the women started out by simply transporting airplanes, later they
became test pilots and they also became flight instructors.