Answer:
The custom of a student delivering a speech at a high school.
Step-by-step explanation:
I would say it is that answer because context implies that this question is asking about the surroundings/time/place that she is giving the speech in rather than about the speech itself. The first two are things verbatim from her speech so they don't apply. The last one is the setting which may work but it specifies it wants the cultural context which refers to social norms and tradition which is exactly what the third answer choice is.