I would say B. Movable type. It's basically saying how is it a movable type for an adverb.
I hope this helps!
"Johannes Gutenberg
Although movable type, as well as paper, first appeared in China, it was in Europe that printing first became mechanized. The earliest mention of a printing press is in a lawsuit in Strasbourg, France, in 1439 revealing construction of a press for Johannes Gutenberg and his associates." -britannica.com
The chosen options do not accurately provide an adverb phrase. None of the given choices are adverb phrases that modify the verb in the sentence. Therefore, effectively, there is no correct answer among the options provided.
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