I'm pretty sure it's context, because it's the answer that makes the most sense.
Answer:
C.
Explanation:
I read the passage and the question in your comments and in my opinion it makes sense for it to be: by showing that only the threat of war has ever caused the British to alter their oppressive policies.
I'm not 100% sure of course because I'm not a genius but I'm quite sure that's it.
So that is much easier for other people to understand the answer and easier to answer.
Answer:
the answer is By expanding the options for lunches,schools could allow students to choose a vegetarian option.
Explanation: