Bright :

Answer: Option B

Narrow : contracted, limited, parochial, illiberal, abridged.
Coward : sissy, sneak, recreant, capon, caitiff.
Sharp : fast, snappy, nimble, rapid, darting.
Dull : feeble, low, lackluster, bovine, surly.
Bright : radiant, vivid, orient, splendent, flamboyant.

Antonym of Bright is Dull.