Read this quotation: a horse! a horse! my kingdom for a horse! william shakespeare, king richard iii, act v, scene iv why is this verse an example of iambic pentameter? a. it contains five metrical feet, each following a pattern of stressed and unstressed syllables. b. the verse forms a pattern of an unstressed syllable immediately followed by a stressed syllable. c. it is a line from shakespeare, and his plays contain verse written only in iambic pentameter. d. the verse is 10 syllables long with an unstressed syllable at the beginning and end.