Answer: B. I love to eat chocolate covered pretzels.
Explanation: A hyphen is a punctuation mark with various uses in english, like separate syllables and join words. In the given sentences, the one that needs a hyphen is option b, "I love to eat chocolate covered pretzels", it should be: "I love to eat chocolate-covered pretzels, without the hyphen we can't tell if they are referring to chocolate pretzels that are covered, of pretzels that are covered with chocolate.
