Final answer:
A heroic couplet is two rhymed lines of iambic pentameter, used traditionally in epic and narrative poetry to express elevated thoughts with a rhythmic and grandiose style.
Step-by-step explanation:
A heroic couplet is (b) two rhymed lines of iambic pentameter. It is a traditional form of English poetry often used in epic and narrative poetry. The term "heroic" is because these couplets often express grandiose or elevated thoughts and have a pronounced rhythm, making them suitable for the portrayal of heroic deeds. Each line of a heroic couplet consists of ten syllables, or five 'feet', with the pattern of an unstressed syllable followed by a stressed syllable (“da-DUM da-DUM da-DUM da-DUM da-DUM”). This pattern is known as iambic pentameter. An example of a heroic couplet can be found in Alexander Pope's “Essay on Criticism,” which utilizes the couplet rhyme scheme.