Answer:
The sentence that is consistently iambic is:
A. Eleven runners ran.
Step-by-step explanation:
An iamb consists of an unstressed syllable followed by a stressed one. If we have three iambs, we say the line is written in iambic trimeter; four iambs, iambic tetrameter; five, iambic pentameter. In option A, we have a iambic line. Let's highlight the stressed syllables so that we can count how many iambs there are:
A. Eleven runners ran.
As we can see, we have three iambs, that is, three sequences of an unstressed syllable followed by a stressed one: 1. elev; 2. en run; 3. ners ran. Therefore, we can say option A is consistently iambic, being an iambic trimeter.