Final answer:
Sophie's mom frequently discusses childhood memories.
Step-by-step explanation:
Sophie's mom frequently discusses a. Childhood memories. This is evident from the reference text that describes Caitlin's experience of missing her home in the context of new customs, language, and surroundings during her visit to Maria's house. Caitlin's homesickness indicates that Sophie's mom frequently discusses childhood memories, which may evoke nostalgia and a sense of longing for home.