The correct answer is A.
The family needs a safe, dry place to sleep in the winter. Their home in the salt cavern is described as an "impregnable castle." Falconhurst had fallen apart and they decided to use it as a summer home. They move to the cave to survive the winter.
What are the sentences ????????
Gawain wears the green girdle as a symbol of his weakness. He behaved deceitfully and returned to Camelot bearing the girdle as a symbol of his failure in keeping his vow.
I suggest either talking or emailing the person grading the exam or someone who could help you.