What is the name of the metrical foot that consists of one accented syllable followed by one unaccented syllable?

The correct term for a metrical foot consisting of one accented syllable followed by one unaccented syllable is an iamb, making it the accurate choice in this context. An iamb is often used in poetry and is characterized by its rhythm, creating a gentle rise in sound that is commonly found in iambic pentameter.

In contrast, a trochee consists of one accented syllable followed by an unaccented syllable, which would not fit the description given in the question. An anapest is a metrical foot made up of two unaccented syllables followed by one accented syllable, while a dactyl has one accented syllable followed by two unaccented syllables. Thus, the definition of the iamb aligns perfectly with the structure specified in the question, cementing it as the correct answer.