There is no passage and answer choices, so it is impossible to answer this question. I apologise.
Answer:
B is what I feel is most correct , might be wrong though...
"The" is the particular article
Articles are like adjectives, they modify nouns
"The" is particular, because it specifies the noun you are talking about. If I say "Let's read the book" I am referring to a specific one
The answer is c because there are 2 people so it should be their.