SAT Form, Structure, and Sense Question

The editors of Home Ground: A Guide to the American Landscape turned to Arturo Longoria, a nonfiction writer; to craft the entry for “arroyo,” a term referring to the bed of an intermittently dry stream or creek. For “lek,” however, the editors chose the <u>________</u> author of The Very Rich Hours. Which choice completes the text so that it conforms to the conventions of Standard English?