What was the dust bowl, and when did it occur?

Which line is an example of perfect iambic pentameter? a. "i have been worth the whistle." b. "whose reverence even the head-lugg'd bear would lick," c. "a man, a prince, by him so benefited! " d. "ere they have done their mischief. where's thy drum? " e. "marry, your manhood, mew! "