In Her Look at Space Shuttle Tragedies, Sociologist Diane Vaughan

In her look at space shuttle tragedies, sociologist Diane Vaughan found that

A) information loss at NASA may have contributed to the space shuttle disasters.
B) everyone at NASA had open lines of communication with all others at NASA.
C) no one was aware of the potential risks of the space shuttle missions she studied.
D) all NASA employees and departments were aware of the potential risks.