Final answer:
The main idea of the passage is that Caitlin misses the quiet and peace of her previous home, as she feels overwhelmed by her new surroundings and the cultural differences encountered there.
The correct option is b) She misses the quiet and peace of her previous home.
Step-by-step explanation:
The main idea of the passage about Caitlin's feelings towards her new environment is that she feels overwhelmed and struggles to adapt to the cultural differences in her new city.
Although the overall experience is exciting, Caitlin initially feels isolated, disconnected, and has trouble with the local customs and language, which cause her to miss the comfort of her own home. The correct option, based on the passage provided,
is therefore b) She misses the quiet and peace of her previous home.