If the underlined phrase is 'deep in the forest', then the answer is A, 'adverb phrase', because it denotes the place where the action happened.
Answer:
"She tried to explain to them why none of them could go back to the plantation. If a runaway returned, he would turn traitor, the master and the overseer would force him to turn traitor."
Answer:
C) I am writing to ask you to read one of stories at the town library's story hour for children.