According to a different source, these are the options that come with this question:
A) were related.
B) became very close.
C) signed a contract.
D) were fixed together.
When the author says that Jiang and the villagers "formed a bond," what he means is that they became very close to each other. The use of expressions can enrich a text by making it more varied and interesting. It can also allow a text to sound more realistic and thus be more persuasive.
