13) Ride was accepted into the astronaut program and began preparing for a space mission. (14) Trained both physically and mentally.

What is the correct way to write sentences 13 and 14?
A) Ride was accepted into the astronaut program and began preparing for a space mission; trained both physically and mentally.
B) Ride was accepted into the astronaut program and began preparing for a space mission by training both physically and mentally.
C) Ride was accepted into the astronaut program and began preparing for a space mission: trained both physically and mentally.
D) Ride was accepted into the astronaut program and began preparing for a space mission and she was training both physically and mentally.