Read the section "Checking The Computer And Abort Systems." Which sentence from the section supports the conclusion that SpaceX's rockets are safer than earlier spacecraft?

A
Behnken and Hurley checked the capsule's computer systems and turned on Crew Dragon's abort system.
B
Now, spacecraft have an abort system to help save the astronauts if there is a problem with the spacecraft.
C
However, it does have controls for the astronauts to use if they need them.
D
He and his crewmates left the flag there on NASA's last mission to the ISS.
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