It most likely means, that’s the only person they can trust, their only friend, etc…
The answer would be D. Just put the other word in place of obtain in the sentence to find your answer. Hope this helps.
Answer:
Based on the plot, he plans to propose and then when the other characters show up things start to go wrong. c
Explanation:
I believe that the arrival of the minor characters cause conflict and this will advance the plot.....