C. The author uses a simile to compare the feeling of nervousness to melting because the sentence uses the word "like," which is an underlying hint to similes. Without it, it would be a metaphor.
The soul selects her own society/then — shuts the door
I am not completely sure, but I would say that the apothecary suggests that Jane go to school because he believes Jane would be happier and healthier away from Gateshead. She tells him how unhappy she is, so that is why he wants to help her.
The figurative language used is metaphors