Answer:
D. Each foot consists of one unstressed followed by a stressed syllable.
Step-by-step explanation:
An iambic pentameter is a line of verse with five metrical feet, each foot containing one stressed syllable and one unstressed one.
Examples of iambic pentameter
Shall I compare thee to a summer's day?
Thou art more lovely and more temperate.
From the two examples, they each contain ten syllables.