The passage that most strongly shows Abuela's lack of familiarity with New Jersey is this: It is January, two feet of snow on the ground and she's wearing a shawl over a thick black dress.
The excerpt from the passage above shows that Abuela did not know nor use the right dress code during the winter period. Instead of wearing heavy clothing, she simply wears a shawl over a thick black dress.
This sort of dressing would not have shielded her from the harsh cold condition. So, the selected option B strongly shows Abuela's lack of familiarity with New Jersey. She used inappropriate clothing for the cold.