Read this sentence from paragraph 2 of The Importance of Sending People to Space.
The capabilities of the space probes and rovers we now use would have been the stuff of science fiction just a few short decades ago.
Which statement explains what the author means by the phrase stuff of science fiction?
A.
Scientists have worked on the ideas for years.
B.
People would not have believed it was possible.
C.
Audiences watched the ideas in blockbuster movies.
D.
The technology was kept from the public.