A compare-and-contrast essay is a style of essay that points out the similarities and differences between two or more subjects. It's ideal for showing what separates and unites related things or concepts, particularly if the subjects are often confused for each other or unjustly lumped together.
The correct answer would be C. Old and new families would be an adverbial phrase because old and new are adverbs that describe what kind of family there are.
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Answer:
write a letter to a friend in another town to tell him that you would like to stay with him for a week