I'm almost 100% sure it's B.
I would say C. It seems like he is saying that the two have different strategies.
Answer:
Lomov came to Chubukov's house to ask for his daughter, Natalya's hand in marriage. Chubukov's reaction to the visit was little surprise because Lomov's visit was sudden and unexpected. Therefore Chubukov pretended to be very polite to him as he thought Lomov had come to borrow money from him.
Explanation: