Answer: Because they don't have five feet in the line or don't have an unstressed syllable followed by a stressed one like iambic pentameter requires.
Explanation: In poetry, an Iambic Pentameter is a metrical speech that has 5 feet on every line. A foot is a pair of syllables in which there is an unstressed syllable followed by a stressed one.
The lines "As wicked dew as e'er my mother brushed" and "With raven’s feather from unwholesome fen" follow the rules of iambic pentameter, while the line "Upon thy wicked dam, come forth!" has just four feet, and the line "Drop on you both! A southwest blow on ye" doesn't have the unstressed syllables at first.
Here's a completion of the passage in the question, and the likely answer:
(I believe you are asked to complete the passage, and find the missing words).
Fortunately, in that moment of “desperate extremity,” the Powhatans brought food and rescued the starving strangers. A year later, several hundred more settlers arrived, and again they quickly ran out of provisions. They were forced to eat “dogs, cats, rats, and mice,” even “CORPSES” dug from graves. “Some have licked up the blood which hathfallen from their weak fellows,” a survivor reported. “One member of our colony murdered his wife, ripped the child out of her womb and threw it into the river, and after chopped the mother in pieces and salted her for his food, the same not being discovered before he had eaten part thereof.” “So great was our famine,” John Smith stated, “that a savage we slew and buried, the poorer sort took him up again and ate him; and so did diverse one another boiled and stewed with roots and herbs.”
I think that the answer is C.
I might be wrong.
This is a compound sentence because you can break it into two sentences.
Hope this helps
Most schools ban soft drinks from student vending machines. It happened when Obama was President & his wife Michelle Obama decided to get rid of all unhealthy food & drinks at schools. Most schools today still observe a healthy diet in schools today.