Final answer:
The line that is an example of iambic pentameter is: Now is the winter of our discontent.
Step-by-step explanation:
The line that is an example of iambic pentameter is:
A. Now is the winter of our discontent.
In iambic pentameter, each line contains five sets of iambs, with each iamb consisting of an unstressed syllable followed by a stressed syllable. The line from option A follows this pattern, with each pair of bolded syllables representing an iamb: Now is the winter of our discontent.