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Verbal·Standard English Conventions·Form, Structure, and Sense

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Now seen as a mechanical precursor to the e-reader, Spanish educator and inventor Ángela Ruiz Robles’s Enciclopedia Mecánica eschewed pages in favor of three horizontal paper scrolls that could be easily swapped out to accommodate a range of subjects. Though Ruiz Robles’s prototype had limited functionality, interactive features described in her 1949 patent—such as a button labeled “verb” that would illuminate relevant text when pressed—__________ an impressive early vision of hypertext.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

reveal

B

reveals

C

revealing

D

has revealed