i am fairly sure the answer is 2
I believe the best choice is C. This is because an ad's primary purpose is to get as many people to view it as possible. :)
The correct answer is this one:
<span>A. of movable type; modifies invention
Adjective phrase modifies nouns: and the noun here is "the invention". It gives us some extra information about this noun, and this is exactly what this phrase does!
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