The correct answer is A. The term iambic pentameter refers to a line of poetry with ten syllables with stress put on every other syllable.
Explanation:
In poetry, the iambic pentameter is a type of structure in verses or metric that includes five iambs and because of this is called iambic pentameter. Additionally, the iamb is a unit composed of two syllables the first one is an unstressed syllable or short syllable and the second one is a stressed or long syllable. This implies each verse with iambic pentameter has ten syllables as each iamb has two syllables and it includes an unstressed-stressed syllable sequence or it has stress one every other syllable. Therefore, "iambic pentameter refers to a line of poetry with ten syllables with stress put on every other syllable".
Her voice was probably very flexible (keep in mind dancing), her voice was very pretty (keep in mind the twinkle) and her voice probably loses focus really fast (keep in mind wandered)