The correct answer is B. She is rigid
Step-by-step explanation:
In the text, the narrator explains Aunt March is not like some old people that despite their age act friendly with children "But Aunt March had not this gift". This suggests on the opposite Aunt March is serious and rigid or strict, this is supported by the fact she is worried about rules "she worried Amy very much with her rules and orders" and she seems to want to control another character called Amy "the old lady felt it her duty to try and counteract". According to these details, it is possible to infer Aunt March is rigid or strict rather than friendly or laid-back.