It’s the first one “the courts that derive their power from the U.S. Constitution”
I am assuming by the subject that you mean societal customs, thus I will provide two in the following statements.
In India, it is a custom to remove your shoes before entering a temple, and to not wear suggestive or otherwise revealing clothing.
In Japan, it is a custom to use honorifics when addressing others.
Answer
A. on trains
Explanation:
my teacher used to make us sit and watch theses long vids for no reason
hoped this helped let me know if it did