|Question 4Verbal

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Science fiction has long served as a ______ real-world technological advancements. Indeed, from Jules Verne’s 1865 novel From the Earth to the Moon inspiring developments in aerospace engineering to the television show Star Trek sparking the design of the ancestor of today’s smartphones, these narratives have spurred many actual innovations.
Which choice completes the text with the most logical and precise word or phrase?
diversion from
A
catalyst of
B
constraint to
C
sponsor of
D