Answer: All of the above use iambic feet.
Step-by-step explanation:
Iambic pentameter is a rhyme scheme in which each line in a sonnet consists of ten syllables. This is a meter preferred in Shakespeare's sonnets. The syllables consist of five pairs, that are called iambic feet. In this specific rhythm, the unstressed syllable is followed by a stressed syllable, which is repeated five times. In Sonnet 18, all of the lines listed contain iambic feet.