The majority of the people working at the Johnson Space Center are D. mission specialists training to be astronauts.
The Johnson Space Center has been the hub of human spaceflight activity for more than half a century.
The Johnson Space Center is responsible for the following spaceflight activities:
Thus, for more than half a century, the JSC located in Florida has been leading human space flight operations for NASA.
In conclusion, the majority of the people working at the Johnson Space Center are D. mission specialists training to be astronauts.
Learn more about the Johnson Space Center at https://brainly.com/question/1334051